How to cite references found in Credo Reference?
According to the Publication Manual of the APA 6th ed., it is not necessary to include database information (p.192). If your instructor expects the database information, it may be acceptable to use "Retrieved from Credo Reference" or "Retrieved from http://www.credoreference.com/."
ENIAC. (2003). In Encyclopedia of Computer Science. Retrieved from http://www.credoreference.com/