How do you cite a paper that you have written in another class in your current paper?
keyword searching is the best answer ? http://scholar.google.com/ would helpful to you.
Are you using a sentence, paragraph etc of your own words? Or from a text?
You can't. You can, however, take the research from the previous paper and apply it to the new one.
You don't need to cite yourself, if what you're citing are your own words and ideas. You do, however, need to cite anything that is not yours. Use the same citation you used in the previous paper, if that is the case.
No, you do not cite yourself. "Grown-up" researchers will do that - since it is a published manuscript and readers can see how they developed their ideas over time, but as a student this looks simply weird.
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