APA (7th ed.) Citation

Harmer. (2012). Essential teacher knowledge: Core concepts in English language teaching. Pearson Education Limited.

Chicago Style (17th ed.) Citation

Harmer. Essential Teacher Knowledge: Core Concepts in English Language Teaching. Essex, England: Pearson Education Limited, 2012.

MLA (8th ed.) Citation

Harmer. Essential Teacher Knowledge: Core Concepts in English Language Teaching. Pearson Education Limited, 2012.

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