A bibliographic citation is a reference to a book, article, web page, or other published item. Citations of both types should supply sufficient detail to identify the item uniquely. Different citation systems and styles are used in scientific citation, legal citation, prior art, and the humanities.
A citation number, used in some systems,
is a number or symbol added inline and usually in
superscript, to refer readers to a footnote or endnote that
cites the source. In other citation systems, an
inline parenthetical reference is used rather than a
citation number, with limited information such as the author's
last name, year of publication, and page number referenced; a
full identification of the source will then appear in an
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