Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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