Author of Article. "Article Title." Title of Book. Place of Publication: Publisher, Date.
When citing familiar reference books, especially those that often appear in new editions, it is not necessary to include full publication information. Give the edition (if available) and the year of publication.
Faron, Louis C. "Inca." Encyclopedia Americana. International Edition. 1992.
When citing less familiar reference books, provide full publication information.
Owen, Alan R. G. "Poltergeists." Man, Myth and Magic: The illustrated Encyclopedia of Mythology, Religion, and the Unknown. Ed. Richard Cavendish. 12 vols. New York: Marshall Cavendish, 1983.