@book{3220,
	author = {Guajardo Cantú, Gerardo and Andrade de Guajardo, Nora E.},
	title = {Contabilidad financiera /},
	publisher = {Mc Graw Hill,},
	year = {1992.},
	address = {México :},
	url = {https://unitecorporativa.files.wordpress.com/2012/02/contabilidad-financieratec.pdf}
}