Wentz, C. A. (1999). Safety, Health, and environmental protection. McGraw-Hill.
Chicago Style (17. basım) AtıfWentz, Charles A. Safety, Health, and Environmental Protection. Boston, Mass.: McGraw-Hill, 1999.
MLA (9th ed.) AtıfWentz, Charles A. Safety, Health, and Environmental Protection. McGraw-Hill, 1999.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..