Summary: APA (American Psychological Association) is most commonly used to cite sources within the social sciences. This resource, revised according to the 6th edition, second printing of the APA manual, offers examples for the general format of APA research papers, in-text citations, endnotes/footnotes, and the reference page.
Kelsey Grabanski. This pin relates with the Ecological System Theory. It describes the different steps of this theory: Microsystem, Mesosystem, Exosystem, macrosystem, and chronosystem. It gives good example of these different steps.