APA (7th ed.) Citation

Lee, W. R., & Coppen, H. (1968). Simple audio-visual aids to foreign-language teaching (2a. ed.). Oxford University.

Chicago Style (17th ed.) Citation

Lee, W. R., and Helen Coppen. Simple Audio-visual Aids to Foreign-language Teaching. 2a. ed. Londres: Oxford University, 1968.

MLA (9th ed.) Citation

Lee, W. R., and Helen Coppen. Simple Audio-visual Aids to Foreign-language Teaching. 2a. ed. Oxford University, 1968.