@book{16541,
	author = {Contreras Hernández, Mauricio and Montaña Galán, Marco Fidel},
	title = {Logros y Competencias Básicas por Grados /},
	publisher = {Ediciones S E M,},
	year = {2004.},
	address = {Bogotá :},
	edition = {2.}
}