Asfahl, C. R. (1990). Industrial safety and health management (2nd ed.). Englewood Cliffs, NJ: Prentice-Hall International.
Παραπομπή Chicago StyleAsfahl, C. Ray. Industrial Safety and Health Management. 2nd ed. Englewood Cliffs, NJ: Prentice-Hall International, 1990.
Παραπομπή MLAAsfahl, C. Ray. Industrial Safety and Health Management. 2nd ed. Englewood Cliffs, NJ: Prentice-Hall International, 1990.
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