What information should parenthetical citations include?
In MLA style, an author-page style parenthetical citation should
include the author's last name and the page number(s) from the
source.
A parenthetical citation for a print source (books, magazines,
scholarly journal articles, newspapers) with a known author should
include a signal word or phrase (usually the author's last name)
and a page number.
A parenthetical citation for print source with no known author
should include a shortened title of the work and a page number.
Other things that may need to be included in a parenthetical
citation include information about the edition of the source, a
first initial if authors have the same last name, the volume number
if citing from different volumes of a multi-volume work, and, when
citing the Bible, the version you are using along with book,
chapter, and verse.