APA Guide for Business Students (6th ed.): Encyclopedias/Dictionaries

Rules

1. Begin with author
2. Title of article is not italicized.
3. Title of the encyclopedia is italicized.
4. Include edition and page numbers in parentheses after encyclopedia name.
5. If an online resource, include URL.

Example 

Heil, K. & Droege, S. B. (2006). Pricing policy and strategy. in M.
      Helms (Ed.). Encyclopedia of managment (5th ed., pp.673-676).
      Retrieved from http://go.galegroup.com/

Rules

1. Begin with title if an author is not identified.
2. Date of access is included as information may change.

Example

Pricing strategies (n.d.). In Wikipedia. Retrieved September 30, 2012
       from http://en.wikipedia.org/wiki/Pricing_strategies