In Cooper, Harris, Camic, Paul M., Long, Debra L., Panter, A. T., Rindskopf, David, Sher, Kenneth J. (eds): APA handbook of research methods in psychology, Vol 2: Research designs: Quantitative, qualitative, neuropsychological, and biological. Washington.

Link: http://www.apa.org/pubs/books/4311505.aspx

Data has been last edited on Feb 15 2013