Wentz, C. A. (1999). Safety, health and environmental protection. Boston: McGraw-Hill.
Trích dẫn kiểu ChicagoWentz, Charles A. Safety, Health and Environmental Protection. Boston: McGraw-Hill, 1999.
Deismireacht MLAWentz, Charles A. Safety, Health and Environmental Protection. Boston: McGraw-Hill, 1999.
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