@book{64893,
	author = {Metcalfe, Darrel S. and Elkins, Donald M.},
	title = {Producción de cosechas},
	publisher = {Limusa,},
	year = {1987},
	address = {México :},
	note = {Trad. de: Crop production: principles and practices 4 ed. en inglés de 1980}
}