Give the year, and the exact date of publication (month, or month and day). If the date is given as a season give the year and season separated by a comma and enclosed in parentheses.
Clay, R. (2008, June). Science vs. ideology: Psychologists fight back about the misuse of research. Monitor on Psychology, 39(6). Retrieved from http://www.apa.org/monitor/
Schwartz, J. (1993, September 30). Obesity affects economic, social status. The Washington Post, pp. A1, A4.