Levy, B. S., Wegman, D. H., Baron, S. L., & Sokas, R. K. (2011). Occupational and environmental health: Recognizing and preventing disease and injury (6th ed.). Oxford University Press.

Levy, Barry S., David H. Wegman, Sherry L. Baron, a Rosemary K. Sokas. Occupational and Environmental Health: Recognizing and Preventing Disease and Injury. 6th ed. New York: Oxford University Press, 2011.

Levy, Barry S., et al. Occupational and Environmental Health: Recognizing and Preventing Disease and Injury. 6th ed. Oxford University Press, 2011.