@book{21171,
	author = {Borell, Adrey E. and Schaffer, Paul M. and E.U.A. Department of Agriculture.},
	title = {Truchas en estanques de granjas y ranchos},
	publisher = {Centro Regional de Ayuda Técnica,},
	year = {1972},
	series = {USDA. Farmer's bulletin},
	address = {México, D. F. :}
}