Gaya APA
Hoover, R, L., Hancock, R, L, , , , , C. (1989).
Health, safety, and environmental control (1989).
:
New York : Van Nostrand Reinhold,.
Gaya MLA
Hoover, Reynold, L., Hancock, Robert, L, , , , , Cs..
"Health, safety, and environmental control".
1989
:
New York : Van Nostrand Reinhold,,
1989.
Text.