Dyfyniad APA

Wentz, C. A. (1999). Safety, health and environmental protection. Boston: McGraw-Hill.

Dyfyniad Arddull Chicago

Wentz, Charles A. Safety, Health and Environmental Protection. Boston: McGraw-Hill, 1999.

Dyfyniad MLA

Wentz, Charles A. Safety, Health and Environmental Protection. Boston: McGraw-Hill, 1999.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.