Gaya APA

Zalom, F, G., Fry, W, E. (1992). Food, Crop Pests, and the Enviromental . America: APS Press.

Gaya MLA

Zalom, Frank, G.., Fry, William, E.. "Food, Crop Pests, and the Enviromental". America: APS Press, 1992. Text.