Cita APA (7a ed.)

Allen, M., Powell, D., & Dolby, D. (2007). IELTS graduation: Student's book. Macmillan.

Cita Chicago Style (17a ed.)

Allen, Mark, Debra Powell, y Dickie Dolby. IELTS Graduation: Student's Book. Oxford: Macmillan, 2007.

Cita MLA (8a ed.)

Allen, Mark, et al. IELTS Graduation: Student's Book. Macmillan, 2007.