@book{172127,
	author = {Brown, Lester R. and Black, Eugene R, pról.},
	title = {Semillas de cambio : la revolución verde y los progresos agrícolas para la decada del setenta  /},
	publisher = { Hemisferio Sur,},
	year = {[197},
	address = {México  :},
	note = {Titulo original: Seeds of change - the green revolution and development in the 1970}
}