Cita APA

Hornby, A. S., & Hornby, A. S. (1958). Oxford progressive English for adult learners. London, Sydney: Oxford University Press.

Citación estilo Chicago

Hornby, Albert Sydney, y Albert Sydney Hornby. Oxford Progressive English for Adult Learners. London, Sydney: Oxford University Press, 1958.

Cita MLA

Hornby, Albert Sydney, y Albert Sydney Hornby. Oxford Progressive English for Adult Learners. London, Sydney: Oxford University Press, 1958.