• Oxford English Dictionary
• Onelook Dictionaries
• Wordsmyth English Dictionary
• IPL: Ready References

Encyclopedias

• Britannica
• Encarta
• Wikipedia, the free Encyclopedia

Style and Usage

• Elements of Style
• The American Heritage Book of English Usage
• A Writer's Reference
• Online Keys for Writers
• Paradigm Online
• Organizing Compositions
• Writing Den
• Writing Resources
• Writing Tips

Citation and Documentation

• School of Social Work Writing Center: The Documented Essay/Research Paper
• APA Style: (APA official site)
• A Writer's Reference: Research and Documentation Online
• Bedford/St. Martin's: Citation Styles
• A Guide for Writing Research Papers: APA Style
• Duke University Libraries: Citing Sources

Writing Centers and Organizations

• Cuny WriteSite
• International Writing Center Association
• Purdue University Online Writing Lab
• Empire College Writing Resource Center
• The University of Victoria: Writer's Guide