Citazione Stile APA (7a Edizione)

Open University & Graddol, D. (2007). Changing English (2nd ed.). Routledge /In association with The Open University.

Citazione stile Chigago Style (17a edizione)

Open University e David Graddol. Changing English. 2nd ed. London: Routledge /In association with The Open University, 2007.

Citatione MLA (9a ed.)

Open University e David Graddol. Changing English. 2nd ed. Routledge /In association with The Open University, 2007.