- Blue Book of Grammar and Punctuation
- This site provides selected chapters from the book with quizzes to test knowledge.
- Grammar Slammer!
- This site provides a brief grammar textbook.
- American HeritageŽ Book of English Usage
- This reference work provides extensive information about grammer and usage with a section devoted devoted to science terms.
- Elements of Style
(Strunk, William, Jr.)
- This reference tool provides the rules of English usage and composition.