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.