@book{19453,
	author = { Gonzalez Alfonso, Cristian Camilo and  Jaramillo Quiñones, Hector Leiton},
	title = {Productive Freedom / },
	publisher = {Corporación Unificada Nacional de Educación Superior,},
	year = {2020.},
	address = {Bogotá (Colombia) :},
	url = {https://drive.google.com/file/d/1aXoeVkLX0AGPmnx02uWJcJrOQGxzqjAo/view?usp=sharing}
}