APA Style CentralAPA Style CENTRAL is the official, authoritative online resource for instruction and reference related to the application and proper use of APA Style. (from the website)
Purdue OWL : APA Style OverviewThe Purdue Online Writing Lab (OWL) provides a good overview and specific examples of APA citations and formatting papers in this style.
DOI FlowchartA DOI or Digital Object Identifier is a permanent link to an article online, no matter where it is hosted. APA Style Blog has put together a flowchart for when and if you should include the DOI in your citation.
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