Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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