A quoting of an authoritative source for substantiation.
American Heritage� Dictionary of the English Language: Fourth
citation is a brief description of one specific information source, usually
appearing in a bibliography, list of references, or a database. It
includes enough information to permit the reader to find the source
and may appear in a number of variant formats, e.g. American Psychological
Association (APA), Modern Language Association (MLA), Council of Biology Editors (CBE), or Chicago
is made of parts, each part indicating specific information about
the source. You can usually tell what type of source is being described
by looking carefully at the citation. The citation below (in APA style) refers
to an article found in a journal called Climatic Change.