Many institutions have excellent websites that can aid all learners in improving their writing, research and presentation skills.
The guides linked here are recommended by our NJIT composition instructors and librarians.
selected academic writing center websites, guides, and handouts Books on Writing and Research
This page lists websites useful for ready reference on questions of vocabulary, syntax, grammar and mechanics.
Strunk's Elements of Style (the original edition)
Developing Coherent Paragraphs University of Toronto