APA Encyclopedia or Dictionary Entry Citation
Author's Last Name, First Initial. Middle Initial. (Year of Publication). Title of entry or article. Name of reference source (Vol. number, pp. pages). Place of Publication: Publisher.
Examples:
Home. (1989). In Oxford English dictionary (Vol. 8, p. 324). New York: Oxford University Press.
Ring, A. A. (1997). Real estate. In Encyclopedia Americana (Vol. 16, pp. 213-214). Danbury, CT: Grolier.
The art of architecture. (2002). In Encyclopædia Britannica: Macropædia (Vol. 1, pp. 243-261). Chicago: Encyclopædia Brittanica.
APA Online Encyclopedia Entry
Author's Last Name, First Initial. Middle Initial. Title of entry or article. In Name of reference source. doi: number
Author's Last Name, First Initial. Middle Initial. Title of entry or article. In Name of reference source. Retrieved from name of database.
Author's Last Name, First Initial. Middle Initial. Title of entry or article. In Name of reference source. Retrieved Date, from complete URL
Example:
Guttentag, J. Demand clause. In Mortgage encyclopedia. doi: 10.1036/0071458492
Concrete. In Funk & Wagnall's new world encyclopedia. Retrieved from Academic Search Premier database.
Photonics. In The Columbia Encyclopedia. (6th ed.). Retrieved September 3, 2008, from http://www.encyclopedia.com/doc/1E1-photonics.html