Cita APA (7a ed.)

Hornby, A. S. (1956). Oxford Progressive English for Adult Learners. Oxford University Press.

Cita Chicago Style (17a ed.)

Hornby, A. S. Oxford Progressive English for Adult Learners. Oxford University Press, 1956.

Cita MLA (8a ed.)

Hornby, A. S. Oxford Progressive English for Adult Learners. Oxford University Press, 1956.