Cita APA (7a ed.)

Bowen, P., & Delaney, D. (2011). Champions: Student's book y workbook, level 2. Oxford University Press.

Cita Chicago Style (17a ed.)

Bowen, Philippa, y Denis Delaney. Champions: Student's Book Y Workbook, Level 2. Oxford: Oxford University Press, 2011.

Cita MLA (9a ed.)

Bowen, Philippa, y Denis Delaney. Champions: Student's Book Y Workbook, Level 2. Oxford University Press, 2011.