@book{11089,
	author = {Severino, Antonio Joaquim and Pinzón, Roberto, },
	title = {Metodología del trabajo científico :},
	publisher = {Cooperativa Editorial Magisterio,},
	year = {2009.},
	series = {Coleción Investigar},
	address = {Bogotá :},
	edition = {2a ed.}
}