APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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