APA

Dummett P., Stephenson H. & Lansford L. (2016). Keynote intermediate student's book. UK: Cengage Learning.

Chicago

Dummett Paul, Stephenson Helen and Lansford Lewis. 2016. Keynote intermediate student's book. UK: Cengage Learning.

Harvard

Dummett P., Stephenson H. and Lansford L. (2016). Keynote intermediate student's book. UK: Cengage Learning.

MLA

Dummett Paul, Stephenson Helen and Lansford Lewis. Keynote intermediate student's book. UK: Cengage Learning. 2016.