APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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