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Writing and Grammar
The Elements of Style
A classic book of simple advice on writing by William Strunk. Even though this is the 1918 edition, it's still good.
Provides infographics on vocabulary, grammar, and commonly confused words.
Paradigm Online Writing Assistant
Nicely designed guide to writing various types of essays and documenting them.
Purdue On-line Writing Lab
The most extensive, oldest, and best-known virtual writing center on the Web. This site offers resources for writers, links to other on-line writing centers.
Quoting & Paraphrasing
When and how to use information from research sources. From the University of Wisconsin-Madison Writing Center.
Basics on spelling, punctuation, grammar, usage, etc. There's also a Writing Resources area with links to many other web resources.
Many areas of writing help, such as a grammar handbook, how to get friendly critiques of your writing, tips and techniques, and more. From the University of Illinois.