Here are some excellent websites for help with APA citations:
http://owl.english.purdue.edu/owl/resource/560/01/
http://www.uwsp.edu/psych/apa4b.htm
Now ... you find some "credible sources" and cite them in APA format. If you want someone here to check your work, feel free to re-post.
Provide three credible sources from the internet for expository essay and cite the sources in APA format.
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