@book{51451,
	author = {Seminar on Plantation Systems of the New World},
	title = {Sistemas de plantaciones en el Nuevo Mundo;},
	publisher = {Unión Panamericana,},
	year = {1960.},
	series = {Estudios monográficos,},
	address = {Washington,},
	note = {"Publicado en cooperación con el Research Institute for the Study of Man, New York."}
}