Cita APA (7a ed.)

Halas, J., & Martin-Harris, R. (1978). Audio-visual techniques for industry. United Nations.

Cita Chicago Style (17a ed.)

Halas, John, y Roy Martin-Harris. Audio-visual Techniques for Industry. New York: United Nations, 1978.

Cita MLA (9a ed.)

Halas, John, y Roy Martin-Harris. Audio-visual Techniques for Industry. United Nations, 1978.