Gaya APA

Gratz, N, G. (1997). Human Lice Their Prevalence, Control and Resistance to Insecticides : a Review 1985-1997 . Geneva: World Health Organization.

Gaya MLA

Gratz, Norman, G. "Human Lice Their Prevalence, Control and Resistance to Insecticides : a Review 1985-1997". Geneva: World Health Organization, 1997. print.