Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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