Cita APA (7a ed.)

Lee, W., & Coppen, H. (1970). Simple audio-visual aids to foreign-language teaching. Oxford University Press.

Cita Chicago Style (17a ed.)

Lee, W.R, y Helen Coppen. Simple Audio-visual Aids to Foreign-language Teaching. Oxford: Oxford University Press, 1970.

Cita MLA (8a ed.)

Lee, W.R, y Helen Coppen. Simple Audio-visual Aids to Foreign-language Teaching. Oxford University Press, 1970.