Gaya APA
FRIED, M, A.
(2010).
Fundamentals of occupational safety and health
(
5th ed.)
.
Lanham:
Government Institutes.
Gaya MLA
FRIED, Mark, A..
"Fundamentals of occupational safety and health".
5th ed.
Lanham:
Government Institutes,
2010.
Buku.