APA

Duff A., Maley A. & Maley A. (2007). Literature. New York: Oxford University Press.

Chicago

Duff Alan, Maley Alan and Maley Alan. 2007. Literature. New York: Oxford University Press.

Harvard

Duff A., Maley A. and Maley A. (2007). Literature. New York: Oxford University Press.

MLA

Duff Alan, Maley Alan and Maley Alan. Literature. New York: Oxford University Press. 2007.