Gaya APA

Beston, G., al, E. (1992). Effectiveness of vitamin A supplementation in the control of young child morbidity and mortality in developing countries . Toronto: University of Toronto, Badan Litbangkes.

Gaya MLA

Beston, G.H.., al, Et. "Effectiveness of vitamin A supplementation in the control of young child morbidity and mortality in developing countries". Toronto: University of Toronto, Badan Litbangkes, 1992. print.