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"Strange to say, however, there is little or nothing bearing upon the subject in the ordinary books of reference. There are only twenty-three lines upon it in the last edition of Chambers' Cyclopaedia; there is no article upon Museums in the last edition of the Encyclopaedia Britannica, but there is a short notice, principally relating to art museums, in the recent supplement to this work. "Museum" does not appear as a title in Leon Vallee's Bibliographie des bibliographies or Petzholdt's Bibliotheca bibliographica. " Museums " is not an independent subject in Mr. Fortescue's exhaustive Subject-index of the modern works in the British Museum, but is included under "Exhibitions" and "Natural History" and such headings as "Anatomy," "Art," "Ceramics" and the like. The title only casually occurs in Mr. Sonnenschein's valuable Reader s Guide and The Best Books. "--Museums, Their History and Their Use (1904) by David Murray

 This page Reference is part of the semiotics series. Illustration: Signified (concept) and signifier (sound-image) as imagined by de Saussure, as featured in Course in General Linguistics
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This page Reference is part of the semiotics series.
Illustration: Signified (concept) and signifier (sound-image) as imagined by de Saussure, as featured in Course in General Linguistics

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Reference is a relation between objects in which one object designates, or acts as a means by which to connect to or link to, another object. The first object in this relation is said to refer to the second object. The second object, the one to which the first object refers, is called the referent of the first object.

References can take on many forms, including: a thought, a sensory perception that is audible (onomatopoeia), visual (text), olfactory, or tactile, emotional state, relationship with other, spacetime coordinate, symbolic or alpha-numeric, a physical object or an energy projection. In some cases, methods are used that intentionally hide the reference from some observers, as in cryptography.

References feature in many spheres of human activity and knowledge, and the term adopts shades of meaning particular to the contexts in which it is used. Some of them are described in the sections below.

Contents

Etymology and meanings

The word reference is derived from Middle English referren, from Middle French référer, from Latin referre, "to carry back", formed from the prefix re- and ferre, "to bear". A number of words derive from the same root, including refer, referee, referential, referent, referendum.

The verb refer (to) and its derivatives may carry the sense of "link to" or "connect to", as in the meanings of reference described in this article. Another sense is "consult"; this is reflected in such expressions as reference work, reference desk, job reference, etc.

Semantics

Sense and Reference

In semantics, reference is generally construed as the relationships between nouns or pronouns and objects that are named by them. Hence, the word "John" refers to the person John. The word "it" refers to some previously specified object. The object referred to is called the referent of the word. Sometimes the word-object relation is called "denotation"; the word denotes the object. The converse relation, the relation from object to word, is called "exemplification"; the object exemplifies what the word denotes. In syntactic analysis, if a word refers to a previous word, the previous word is called the "antecedent".

Meaning

Gottlob Frege argued that reference cannot be treated as identical with meaning: "Hesperus" (an ancient Greek name for the evening star) and "Phosphorus" (an ancient Greek name for the morning star) both refer to Venus, but the astronomical fact that '"Hesperus" is "Phosphorus"' can still be informative, even if the "meanings" of "Hesperus" and "Phosphorus" are already known. This problem led Frege to distinguish between the sense and reference of a word. Some cases seem to be too complicated to be classified within this framework; the acceptance of the notion of secondary reference may be necessary to fill the gap. See also Opaque context.

Absent referent

Absent referent

Words can often be meaningful without having a concrete here-and-now referent. Fictional and mythological names such as "Pegasus" and "Hercules" illustrate this possibility. Sign links with absent referents also allow for discussing abstract ideas ("love," "peace") as well as people and events of the past and future.

For those who argue that one cannot directly experience the divine (e.g. God), the sign "God" can serve as an example of a reference with an absent referent. Additionally, certain sects of Judaism and other religions consider it sinful to write, discard, or deface the name of the divine. To avoid this problem, the signifier G-d is sometimes used, though this could be seen as a sign that refers to another sign with an absent referent.

Linguistic sign

The very concept of the linguistic sign is the combination of content and expression, the former of which may refer entities in the world or refer more abstract concepts, e.g. thought. Certain parts of speech exist only to express reference, namely anaphora such as pronouns. The subset of reflexives expresses co-reference of two participants in a sentence. These could be the agent (actor) and patient (acted on), as in "The man washed himself", the theme and recipient, as in "I showed Mary to herself", or various other possible combinations.

Computer science

In computer science, references are data types that refer to an object elsewhere in memory and are used to construct a wide variety of data structures, such as linked lists. Generally, a reference is a value that enables a program to directly access the particular data item. Most programming languages support some form of reference. For the specific type of reference used in the C++ language, see reference (C++).

The notion of reference is also important in relational database theory; see referential integrity.

Library and information sciences

References to many types of printed matter may come in an electronic or machine-readable form. For books, there exists the ISBN and for journal articles, the Digital object identifier (DOI) is gaining relevance. Information on the Internet may be referred to by a Uniform Resource Identifier (URI).

Psychology

In terms of mental processing, a self-reference is used in psychology to establish identification with a mental state during self-analysis. This seeks to allow the individual to develop own frames of reference in a greater state of immediate awareness. However, it can laso lead to circular reasoning, preventing evolution of thought.

Scholarship

In academics and scholarship, an author-title-date information in bibliographies and footnotes, specifying complete works of other people. Copying of material by another author without proper citation or without required permissions is plagiarism.

Keeping a diary allows an individual to use references for personal organization, whether or not anyone else understands the systems of reference used. However, scholars have studied methods of reference because of their key role in communication and co-operation between different people, and also because of misunderstandings that can arise. Modern academic study of reference has been developing since the 19th century.

In scholarship, a reference may be a citation of a text that has been used in the creation of a piece of work such as an essay, report, or oration. Its primary purpose is to allow people who read such work to examine the author's sources, either for validity or to learn more about the subject. Such items are often listed at the end of an article or book in a section marked "Bibliography" or "References". A bibliographical section often contains works not cited by the author, but used as background reading or listed as potentially useful to the reader. A reference section contains all of the works and only those works cited by the author(s) in the main text.

Law

In patent law, a reference is a document that can be used to show the state of knowledge at a given time and that therefore may make a claimed invention obvious or anticipated. Examples of references are patents of any country, magazine articles, Ph.D. theses that are indexed and thus accessible to those interested in finding information about the subject matter, and to some extent Internet material that is similarly accessible.

Arts

In art, a reference is an item from which a work is based. This may include:

  • an existing artwork,
  • a reproduction (i.e., photo),
  • directly observed object (i.e., person), or
  • the artist's memory.

Another example of reference is samples of various musical works being incorporated into a new one.

See also

See also




Unless indicated otherwise, the text in this article is either based on Wikipedia article "Reference" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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