Hammer, W., & Price, D. (2001). Occupational safety management and engineering (5th ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Hammer, Willie, agus Dennis Price. Occupational Safety Management and Engineering. 5th ed. Upper Saddle River, N.J: Prentice Hall, 2001.
Lua MLA (9ú heag.)Hammer, Willie, agus Dennis Price. Occupational Safety Management and Engineering. 5th ed. Prentice Hall, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.