Gaya APA

Friend, M, A., Kohn, J, P. (2007). FUNDAMENTALS OF OCCUPATIONAL SAFETY AND HEALTH (Fourth Edition). United states of America: GOVERMENT INSTITUTES.

Gaya MLA

Friend, Mark, A., Kohn, James, P. "FUNDAMENTALS OF OCCUPATIONAL SAFETY AND HEALTH". Fourth Edition United states of America: GOVERMENT INSTITUTES, 2007. Text.