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Important note: Reusing an image (whether that is a table, figure, graph, picture, cartoon, etc.) has a slightly different copyright consideration than using information from text-based sources. You can find an image "freely available" on the web, but that does not mean it is free of copyright restrictions. Alternately, giving proper citation (as in the examples here) is not the same thing as copyright clearance.
Copyright must be obeyed in all circumstances, even for in-class-only assignments. Especially if you are reusing an image for publication or dissemination outside of class, please review copyright restrictions. Using items with Creative Commons licenses is a good way to have more flexibility with regards to copyright. APA has a good series of informational posts about copyright permissions here.