Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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