APA Citation Style, 7th edition: Entry in a Reference Work

General Format

In-Text Citation (Paraphrase): 

(Author Surname, Year)

In-Text Citation (Quotation):

(Author Surname, Year, page number [if available])

References:

Author Surname, First Initial. Second Initial. (Year; if not known, put n.d.). Title of entry. In Editor First Initial. Second Initial. Surname (Ed.), Title of reference work (edition, Vol. #). URL

Example

In-Text Citation (Paraphrase): 

(Graham, 2005)

In-Text Citation (Quotation):

(Graham, 2005)

References:

Graham, G. (2005). Behaviorism. In E. N. Zalta (Ed.), The Stanford encyclopedia of philosophy (Fall 2007 ed.). http://plato.stanford.edu/entries/behaviorism/