Cita APA (7a ed.)

Kerr, P., & Jones, C. (2005). Straightforward: Intermediate student́s book. Macmillan Education.

Cita Chicago Style (17a ed.)

Kerr, Philip, y Ceri Jones. Straightforward: Intermediate Student́s Book. Oxford: Macmillan Education, 2005.

Cita MLA (9a ed.)

Kerr, Philip, y Ceri Jones. Straightforward: Intermediate Student́s Book. Macmillan Education, 2005.