The MJC Library & Learning Center has a number of resources to help you with your presentation; check the resources below or make an appointment with a librarian.
Keep in mind that if you want to present your image in a PowerPoint, it should be at least 72dpi, and about 1024x768 pixels.
10 Steps to Successful Presentations, 2nd Edition
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Better Presentations
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Your image source should be attributed with both in-text citation (usually in the form of a caption) as well as a corresponding entry in your References list to maintain academic integrity, even when you use a copyright free image that specifically says no attribution required.
A reader should not have to refer to the text to understand the image. Explanatory text should include title, owner/artist and where the image is stored. In APA you must provide a copyright attribution in addition to citing item when you reproduce it in the body of your work. Clip art or stock images are covered in the seventh edition APA Style manuals in the Publication Manual Sections 12.14 to 12.18 and the Concise Guide Section 10.12.
In general, citing images can be complex. But don't fret; just do the best you can. Find photographer or artist's name; a date the photo was taken or when the image was created; where the original is stored; and where you found it (URL or publication information). Construct a citation as best as you can with that information.