Cita APA (7th ed.)

Hornby, A. S. (1966). Oxford progressive english alternative course. U. pr..

Cita Chicago (17th ed.)

Hornby, A. S. Oxford Progressive English Alternative Course. London: U. pr., 1966.

Cita MLA (9th ed.)

Hornby, A. S. Oxford Progressive English Alternative Course. U. pr., 1966.