Cita APA (7th ed.)

Yule, . G. (2006). Oxford practice grammar advanced with answer. Oxford University Press.

Cita Chicago (17th ed.)

Yule, George. Oxford Practice Grammar Advanced with Answer. Inglaterra: Oxford University Press, 2006.

Cita MLA (9th ed.)

Yule, George. Oxford Practice Grammar Advanced with Answer. Oxford University Press, 2006.