APA (7th ed.) Citation

Kerr, P. (2012). Straightforward: Pre-intermediate student's book. Macmillan.

Chicago Style (17th ed.) Citation

Kerr, Philip. Straightforward: Pre-intermediate Student's Book. Oxford: Macmillan, 2012.

MLA (9th ed.) Citation

Kerr, Philip. Straightforward: Pre-intermediate Student's Book. Macmillan, 2012.