APA (7th ed.) Citation

Harmer. (1998). How to teach English. Longman.

Chicago Style (17th ed.) Citation

Harmer. How to Teach English. Harlow: Longman, 1998.

MLA (8th ed.) Citation

Harmer. How to Teach English. Longman, 1998.

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