APA (7th ed.) Citation

O'Brien, R., Dubos, R., Margenau, H., & Snow, C. (1972). Machines. Time-Life Books.

Chicago Style (17th ed.) Citation

O'Brien, Robert, Rene Dubos, Henry Margenau, and C.P Snow. Machines. New York: Time-Life Books, 1972.

MLA (9th ed.) Citation

O'Brien, Robert, et al. Machines. Time-Life Books, 1972.