APA (7th ed.) Zitazioa
Friend, M. A., & Kohn, J. P. (2010). Fundamentals of occupational safety and health (5th ed.). Government Institutes.
Chicago Style (17th ed.) Zitazioa
Friend, Mark A., eta James P. Kohn. Fundamentals of Occupational Safety and Health. 5th ed. Lanham: Government Institutes, 2010.
MLA (9th ed.) Zitazioa
Friend, Mark A., eta James P. Kohn. Fundamentals of Occupational Safety and Health. 5th ed. Government Institutes, 2010.
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