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The APA Style Blog is the official companion to the Publication Manual of the American Psychological Association, Sixth Edition. It's run by a group of experts who work with APA Style every day.
Plagiarism (representing the intellectual work of others as one’s own) is a species of academic dishonesty, and as such is subject to academic penalty. Properly acknowledging the work of others in your papers is the domain of citation; your papers must properly cite others work where you've used it.
Check the Academic Integrity guide in Student Papers & Academic Research Kit (York University, Ontario)