It's also called plagarism when you don't cite your source documents(whether they be digital, hardcopy, fiche or whatnot), and is punishable by law. Cite all sources, where ever you obtain your information. When you paraphrase or whatever. Cite, cite, cite!
Purdue University has OWL (Online Writing Lab) that has examples for all the various examples of citing you may ever need to know (MLA, APA and various other ways that documents may be required to do their documentation).
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