Cita APA (7a ed.)

Duff, A., & Maley, A. (1990). Literature. Oxford University.

Cita Chicago Style (17a ed.)

Duff, Alan, y Alan Maley. Literature. Oxford: Oxford University, 1990.

Cita MLA (9a ed.)

Duff, Alan, y Alan Maley. Literature. Oxford University, 1990.