APA (7th ed.) Citation

Thornbury & Harmer. (1999). How to teach grammar. Longman.

Chicago Style (17th ed.) Citation

Thornbury and Harmer. How to Teach Grammar. London: Longman, 1999.

MLA (9th ed.) Citation

Thornbury and Harmer. How to Teach Grammar. Longman, 1999.

Warning: These citations may not always be 100% accurate.