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, NY: 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, IL: Encyclopædia Brittanica.
APA Online Encyclopedia Entry
Author's Last Name, First Initial. Middle Initial. (Year of publication). Title of entry or article. In Name of editor (Ed.), Name of reference source. City of publication, State: Publisher. (If retrieved from a database, it will look like a print source)
Author's Last Name, First Initial. Middle Initial. (Year of publication). Title of entry or article. In Name of editor (Ed.), Name of reference source. Retrieved from complete URL from authoritative website
Author's Last Name, First Initial. Middle Initial. (Year of publication). Title of entry or article. In Name of reference source. doi: number
Example:
E.B., & L.E. (2009). Dyslexia. In S. Wallace (Ed.), A Dictionary of education. Thousand Oaks, CA: Sage.
Photonics. In The Columbia Encyclopedia. (6th ed.). Retrieved from http://www.encyclopedia.com/doc/1E1-photonics.html
Guttentag, J. Demand clause. In Mortgage encyclopedia. doi:10.1036/0071458492