Cita APA (7a ed.)

Scrivener, J., & Bowen, T. (2011). Straightforward: Upper intermediate Portfolio (1st published.). MacMillan.

Cita Chicago Style (17a ed.)

Scrivener, Jim, y Tim Bowen. Straightforward: Upper Intermediate Portfolio. 1st published. Oxford: MacMillan, 2011.

Cita MLA (9a ed.)

Scrivener, Jim, y Tim Bowen. Straightforward: Upper Intermediate Portfolio. 1st published. MacMillan, 2011.