This is one of the best writing resources online. This website includes detailed and authoritative information on writing, research, citation, subject-specific writing, and more. Full of helpful writing and document examples.
Excellent collection of guides and videos about all aspects of writing and citation. Includes guides about writing in specific formats and disciplines.
8 tips from famous writer Kurt Vonnegut. You may use this more in your everyday writing than for a research paper, but the tips hold true for many formats of writing.