Gaya APA
L, G. (2011).
Occupational Safety And Health For Technologists, Engineers, And Managers (Seventh Edition).
Amerika:
Pearson.
Gaya MLA
L, Goetsch,David.
"Occupational Safety And Health For Technologists, Engineers, And Managers".
Seventh Edition
Amerika:
Pearson,
2011.
Textbook.