Cita APA (7th ed.)

Seidlhofer, B. (2011). Understanding English as a lingua franca. Oxford University Press.

Cita Chicago (17th ed.)

Seidlhofer, Barbara. Understanding English as a Lingua Franca. Oxford: Oxford University Press, 2011.

Cita MLA (8th ed.)

Seidlhofer, Barbara. Understanding English as a Lingua Franca. Oxford University Press, 2011.