@book{105831,
	author = {Petras, James F., and Veltmeyer, Henry,},
	title = {El sistema en crisis :},
	publisher = {Editorial Popular,},
	year = {[2004]},
	series = {0 a la izquierda},
	address = {Madrid :},
	url = {https://login.zproxy.cun.edu.co/login?url=https://www.digitaliapublishing.com/a/155996/}
}