The TESOL International Association has teamed up with the Wiley publishing company to produce the TESOL Encyclopedia of English Language Teaching. It’s available now here. This is a comprehensive, multi-volume examination of just about everything you need to know about teaching English to speakers of other languages. I wrote an entry in the volume on teaching speaking and pronunciation. The whole encyclopedia is pretty expensive, so your best be is probably getting your institution’s library to purchase it. It is available in printed format or, of course, in an electronic version which allows for easy and extensive searching. Check it out!