Asfahl, C. R. (1999). Industrial safety and health management (4th ed.). Upper Saddle River, N.J.: Prentice-Hall.
Παραπομπή Chicago StyleAsfahl, C. Ray. Industrial Safety and Health Management. 4th ed. Upper Saddle River, N.J.: Prentice-Hall, 1999.
Παραπομπή MLAAsfahl, C. Ray. Industrial Safety and Health Management. 4th ed. Upper Saddle River, N.J.: Prentice-Hall, 1999.
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