@book{3992,
	author = {Christensen, Howard B.},
	title = {Estadística paso a paso},
	publisher = {Trillas},
	year = {1990},
	address = {México :},
	edition = {2a. ed.},
	url = {https://www.biblioeco.unsa.edu.ar/pmb/images/libros/L127174.jpg}
}