APA (7th ed.) Citation

Lee, W. R., & Coppen, H. E. (1968). Simple audio-visual aids to foreign-language teaching (2nd ed.). Oxford U.P..

Chicago Style (17th ed.) Citation

Lee, W. R., and Helen Elizabeth Coppen. Simple Audio-visual Aids to Foreign-language Teaching. 2nd ed. London: Oxford U.P., 1968.

MLA (8th ed.) Citation

Lee, W. R., and Helen Elizabeth Coppen. Simple Audio-visual Aids to Foreign-language Teaching. 2nd ed. Oxford U.P., 1968.