@book{30295,
	author = {Cervo, Amado Luiz. and Bervian, Pedro Alcino.},
	title = {Metodología científica /},
	publisher = {McGraw Hill Interamericana,},
	year = {1980.},
	series = {(Creatividad siglo XXI)},
	address = {Bogotá :},
	note = {Incluye índice.}
}