Perrin, R. (2009). Pocket guide to APA style: Robert Perrin (Updated 3rd edition.). Wadsworth, Cengage Learning.
Tohutoru Kātū ChicagoPerrin, Robert. Pocket Guide to APA Style: Robert Perrin. Updated 3rd edition. Boston: Wadsworth, Cengage Learning, 2009.
Tohutoro MLAPerrin, Robert. Pocket Guide to APA Style: Robert Perrin. Updated 3rd edition. Wadsworth, Cengage Learning, 2009.
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