If there is a DOI:
Author last name, author first initial. (Year). Article title. Journal title, volume(issue), pages. DOI
Sagarin, B. J., & Lawler-Sagarin, K. A. (2005). Critically evaluating competing theories: An exercise based on the Kitty Genovese murder.Teaching of Psychology, 32(3), 167–169. http://doi.org/10.1207/s15328023top3203_8
If there is no DOI, then use the home page of the journal website:
Author last name, author first initial. (Year). Article title. Journal title, volume(issue), pages. Retrieved from journal home page
Reitzes, D. C., & Mutran, E. J. (2004). The transition to retirement: Stages and factors that influence retirement adjustment. International Journal of Aging and Human Development, 59(1), 63-84. Retrieved from http://www.baywood.com/journals/PreviewJournals.asp?Id=0091-4150
If there is a DOI:
Author last name, author first initial. (Year). Ebook title. DOI
Chaffe-Stengel, P., & Stengel, D. (2012). Working with sample data: Exploration and inference. http://doi.org/10.4128/9781606492147
If there is no DOI, then use the home page of the database:
Author last name, author first initial. (Year). Ebook title. Retrieved from database home page
​Miller, L. (2008). Careers for nature lovers & other outdoor types. Retrieved from http://www.ebscohost.com
APA does not require that you cite personal communications (such as interviews you've conducted) in your reference list. Instead, give only an in-text citation using the following model:
Joe Smith (personal communication, November 18, 2006) informed me that the server had crashed several hours ago.
Author last name, author first initial. (Date). Article title. Retrieved from website address.
McCombs, M. & Shaw, D.L. (2010). Agenda setting theory. Retrieved from http://communicationtheory.org/agenda-setting-theory/