@book{6846,
	author = {Acosta, Manuel José and Angarita Guzmán, Helio},
	title = {Modulo de dibujo constructivo I},
	publisher = {Politecnico Colombiano, Taller litográfico. },
	year = {1985.},
	series = {Programas descentralizados},
	address = {Medellín:}
}