Citazione APA

 Harmer, J. (2012).  Essential Teacher Knowledge: Core concepts in english language teaching.  Pearson Education Limited.

Stile di citazione Chicago

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

Citazione MLA

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

Attenzione: Queste citazioni potrebbero non essere precise al 100%.