Cita APA (7th ed.)

Eastwood, J. (2006). Oxford practice grammar basic with answers. Oxford University press.

Cita Chicago (17th ed.)

Eastwood, John. Oxford Practice Grammar Basic with Answers. Inglaterra: Oxford University press, 2006.

Cita MLA (9th ed.)

Eastwood, John. Oxford Practice Grammar Basic with Answers. Oxford University press, 2006.