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