Gaya APA
Asfahl, C, R.
(1999).
Industrial safety and health management
(
4th ed.)
.
Upper Saddle River, NJ:
Prentice Hall.
Gaya MLA
Asfahl, C., Ray.
"Industrial safety and health management".
4th ed.
Upper Saddle River, NJ:
Prentice Hall,
1999.
Text.