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This is the list of books, which I recommend to read. If you are going to take the CELTA course or not, still personally I find them useful! So, here we go!
1. Penny Ur "course in language teaching"
2. Harmer "How to teach English"
3. Scrivener "Learning teaching"
4. Michael Swan "Practical English usage"
5. M. Parrot "Grammar for English language teachers"
6. Penny Ur "Teaching Listening Comprehension"
7. Norbert Schmitt "Vocabulary in Language Teaching"
8. How to teach pronunciation by Gerald Kelly
9. Developing Reading Skills: A Practical Guide to Reading Comprehension Exercises by Francoise Grellet