@book{37760,
	author = {Kula, Witold. and Zembrzuski, Estanislao J.,},
	title = {Teoría económica del sistema feudal /},
	publisher = {Siglo Veintiuno,},
	year = {1979.},
	address = {México (City) :},
	edition = {3a. ed. en español.},
	note = {Traducido de: An economic theory of the feudal system}
}