- Purdue University Online Grammar
- English Grammar Guide
- How to Write a Term Paper (WikiHow)
- Writing a Research Paper (Purdue OWL)
- Strategies for Essay Writing (Harvard Writing Center)
- Brief Guides to Writing in the Disciplines (Harvard Writing Center)
- Daily Grammar
- Moutoux' Guide to Sentence Diagramming
- The Writer's Handbook (UW-Madison)
- PrepStep (online practice exams on English and other subjects)
