WENTZ, C. A. (1998). Safety, health, and environmental protection. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)WENTZ, Charles A. Safety, Health, and Environmental Protection. Boston: McGraw-Hill, 1998.
Lua MLA (9ú heag.)WENTZ, Charles A. Safety, Health, and Environmental Protection. McGraw-Hill, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.