Citazione Stile APA (7a Edizione)

Dellar, H., & Walkley, A. (2010). Upper intermediate outcomes: Student´s book. Heinle, Cengage Learning EMEA.

Citazione stile Chigago Style (17a edizione)

Dellar, Hugh, e Andrew Walkley. Upper Intermediate Outcomes: Student´s Book. Hampshire: Heinle, Cengage Learning EMEA, 2010.

Citatione MLA (9a ed.)

Dellar, Hugh, e Andrew Walkley. Upper Intermediate Outcomes: Student´s Book. Heinle, Cengage Learning EMEA, 2010.