Here are some helpful links:
The MIT handbook on academic integrity.
"The Science of Scientific Writing" by George D. Gopen and Judith A. Swan (PDF)
"Errors in Mathematical Writing" by Keith Conrad (PDF)
"A Guide to Writing Mathematics" by Kevin P. Lee (PDF)
The Cambridge University LaTeX Page
"A Short Math Guide for LaTeX" by Michael Downes (PDF)
"The Not So Short Introduction to LaTeX 2e" by Tobias Oetiker (PDF)