We, at All Things ELT think that one of the most important weapons in the English language teachers arsenal is resources. So to make your life easier we have put to together a list of important reading for teachers. If you have any to add please get in touch.
An A-Z of ELT by Scott Thornbury
A Course in English Language Teaching by Penny Ur
Practical English Usage by Michael Swan
Classroom Dynamics by Jill Hadfield
Principles of Language Learning and Teaching by H Douglas Brown