Editions or volumes (e.g., 2nd ed. or Vol.4) go in parentheses right after the title without any period or comma separating this information from the title, and this information is not italicized.
Wing, L. (Ed.). (1976). Early childhood autism: Clinical, educational and social aspects (2nd ed.). Oxford, NY: Pergamon.
Chapter in an Edited Book
Give pages numbers for chapters in an edited book. Here is the pattern:
Author, A. A. (2013). Title of Chapter. In B. B. Editor (Ed.), Title of book (pp. xx-xx). Location: Publisher.
Donlan, C. (2007). Mathematical development in children with specific language impairments. In D. B. Berch, & M. M. Mazzocco (Eds.), Why is math so hard for some children?: The nature and origins of mathematical learning difficulties and disabilities (pp. 151-172). Baltimore, MD: Paul H. Brookes.
If each issue of a journal begins with page 1, give the issue number in parentheses after the volume number. The issue and page numbers are not italicized.
Blanco, P. J., & Ray, D. C. (2011). Play therapy in elementary schools: A best practice for improving academic achievement. Journal of Counseling & Development, 89(2), 235-243. http://dx.doi.org/10.1002/j.1556-6678.2011.tb00083.x
(American Psychological Association, 2010, pp. 184-186)