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Blue Book of Grammar and Punctuation
Look under Grammar or Punctuation for rules with examples.

Dictionary.com
Including English grammar, usage and style guides and references.

Elements of Style
The essential text by William Strunk, in its first edition, 1918 (in the public domain). Anyone who wants to write in English must own their own copy of this!

Guide to Grammar and Writing
Pull down menus lead to instruction. This site includes guidance for writing essays and research papers.

OWL; Online Writing Lab
From Purdue University, instruction for students and teachers of writing that includes links to other Internet resources.