When a book has an editor instead of an author, the editor's name is followed by "Ed." in parentheses.
Reference:
Robinson, D.N. (Ed.). (1992). Social discourse and moral judgment. San Diego, CA: Academic Press.
In text:
Paraphrase: (Robinson, 1992)
Quotation: (Robinson, 1992, p. 72)
If there is more than one editor, the plural form "Eds." is used:
Reference:
Johnson, N. G., Roberts, M. C., & Worell, J. (Eds.). (1999). Beyond appearance: A new look at adolescent girls.
doi:10.1037/10325-000
In-text:
Paraphrase: (Johnson, Roberts, & Worell, 1992)
Quotation: (Johnson, Roberts, & Worell, 1992, p. 125)
The editor's name is given in normal order and is followed by "Ed." in parentheses. If there is more than one editor, then “Eds.” is used.
Reference:
Sweller, J. (2005). Implications of cognitive load theory for multimedia learning. In R. E. Mayer (Ed.), The Cambridge handbook of multimedia learning (pp. 19-30). doi:10.1017/CBO9780511816819
In text:
Paraphrase: (Sweller, 2005)
Quotation: (Sweller, 2005, p. 25)