APA Style 6th edition, Documentation Guide from the Writing Center at the University of Wisconsin-Madison.
Quick guide to APA style 6th ed. from the Writing Center at the University of Wisconsin-Madison.
APA Formatting and Style Guide 6th edition from the Online Writing Lab (OWL) at Purdue University.
APA Style 7th edition, Quick Reference Guide from the American Psychological Association.
APA Style 7th edition, Instructional Aids from the American Psychological Association
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