Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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