Goodreads helps you keep track of books you want to read.
Start by marking “Extra Help for ESL Writers: A Supplement to Accompany A Writer's Reference” as Want to Read:
To see what your friends thought of this book, please sign up.
While the tone here can be a bit stiff, and takes a very traditional position on ESL teaching, the tips are quite helpful--and not just for ELL students, but for novice students as well. It's also available as a pdf or, if need be, could be purchased at a really low price on ebay.