Submitting work done by you, but for another class or another purpose without documenting that it was previously used.
Purchasing a pre-written paper (either by mail or electronically).
Failure to put a paraphrase in your own words, even if documented.
Failure to put a summary in your own words, even if documented.
Paying someone else to write part or all of a paper for you.
Failure to "quote" or block quote author's exact words, even if documented.
Creating phony citations.
Submitting as your own, work done jointly by a group in which you may have participated.
Failure to cite a source that is not common knowledge.