Cita APA (7th ed.)

Swan, M., & Walter, C. (2011). Oxford english grammar course: Intermediate. Oxford University Press.

Cita Chicago (17th ed.)

Swan, Michael, i Catherine Walter. Oxford English Grammar Course: Intermediate. New York: Oxford University Press, 2011.

Cita MLA (9th ed.)

Swan, Michael, i Catherine Walter. Oxford English Grammar Course: Intermediate. Oxford University Press, 2011.