Cita APA (7th ed.)
Friend, M. A., & Kohn, J. P. (2010). Fundamentals of occupational safety and health (5th ed.). Government Institutes.
Cita Chicago (17th ed.)
Friend, Mark A., i James P. Kohn. Fundamentals of Occupational Safety and Health. 5th ed. Lanham: Government Institutes, 2010.
Cita MLA (9th ed.)
Friend, Mark A., i James P. Kohn. Fundamentals of Occupational Safety and Health. 5th ed. Government Institutes, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.