APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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