Citazione Stile APA (7a Edizione)

Dellar, H., & Walkley, A. (2012). Outcomes Advanced. Heinle Cengage Learning.

Citazione stile Chigago Style (17a edizione)

Dellar, Hugh, e Andrew Walkley. Outcomes Advanced. [Hampshire]: Heinle Cengage Learning, 2012.

Citatione MLA (9a ed.)

Dellar, Hugh, e Andrew Walkley. Outcomes Advanced. Heinle Cengage Learning, 2012.