APA Style

Doff, A. et al (2016). Cambridge English Empower Starter Student's Book w/OL Assessment & OL WB . Cambridge: Cambride University PRESS.

MLA Style

Doff, Adrian. et al. "Cambridge English Empower Starter Student's Book w/OL Assessment & OL WB". Cambridge: Cambride University PRESS, 2016. Bahasa Inggris.