Cita APA (7a ed.)

Kerr, P. (2005). Straightforward: Pre-intermediate. Macmillan Education.

Cita Chicago Style (17a ed.)

Kerr, Philip. Straightforward: Pre-intermediate. Oxford: Macmillan Education, 2005.

Cita MLA (9a ed.)

Kerr, Philip. Straightforward: Pre-intermediate. Macmillan Education, 2005.