Cita APA (7th ed.)

GRAVER, B. (1984). Advanced english practice: With key .-- Ed.2. Oxford University Press.

Cita Chicago (17th ed.)

GRAVER, B.D. Advanced English Practice: With Key .-- Ed.2. Oxford: Oxford University Press, 1984.

Cita MLA (9th ed.)

GRAVER, B.D. Advanced English Practice: With Key .-- Ed.2. Oxford University Press, 1984.