Gaya APA
Supervisors safety manual. (1973).
Chicago:
National Safety Council.
Gaya Chicago
Supervisors safety manual.
text.
Chicago:
National Safety Council,
1973.
.
Gaya MLA
Supervisors safety manual.
text.
Chicago:
National Safety Council,
1973.
.
Gaya Turabian
Supervisors safety manual.
Chicago:
National Safety Council,
1973.
.