Footnote and endnote citations for encyclopedias differ from book citations. Here is the general construction of an encyclopedia citation in a footnote or endnote:
For further info, see sections 14.247 and 14.248 of the Manual.
Dictionary of American Biography, s.v. "Gillespie, Dizzy."
Encyclopedia Article with author and publication information:
Mogens Herman Hansen, "Athenian Democracy," The Oxford Classical Dictionary, 3rd ed. (Oxford, U.K: Oxford University
Article from an Online Encyclopedia through the WSU University Libraries website:
The Oxford Companion to Western Art, s.v. "O'Keefe, Georgia," accessed June 14, 2011, http://www.oxfordreference.com/
Article from an Encyclopedia on the free Web:
Wikipedia, s.v. "Wilt Chamberlain," last modified June 12, 2011, http://en.wikipedia.org/wiki/Wilt_Chamberlin.