A “citation” is the brief bibliographic information in the body of a paper that refers the reader to a complete reference in the bibliography. A citation typically consists of a bibliography number or the author and year in parentheses:
... of the species at hand1.
... of the species at hand (Argus, 1991).
Pages uses an EndNote output style to determine the format.
You can easily change the style of your citations at any time. See Reformatting with a Different Style.