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1
Publication manual of the American Psychological Association : The official guide to APA style / American Psychological Association
Washington, DC, 2020 : American Psychological Association, 2020
xxii, 428 p. : ill. ; 28 cm.
2
Student guidebook to proper citation in APA style / Muriel Harris.
New Jersey : Prentice Hall , 2006
41 p. ; 19 cm.