APA stands for American Psychological Association. It is commonly used to cite sources within the social sciences.
The Purdue Online Writing Lab.
APA 6th edition tutorial Note: the reference list is discussed on slides 17-25
APA Style Guide to Electronic Resources
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Annotated Bibliographies from Purdue OWL
APA Style Blog - Use this blog to review more-detailed discussions of how to apply APA style and format to your writing.
DOI Formatting in APA - How to use the New DOI Format in APA
Find a doi - Search by article title and author last name