@book{602,
	author = {Martin, James, },
	title = {Computer data-base organization /},
	publisher = {Prentice Hall, },
	year = {1977},
	series = {Prentice-Hall series in automatic computation},
	address = {Englewood Cliffs, NJ :},
	edition = {2 ed.},
	url = {https://www.cicy.mx/sitios/sib/doctoelectronico/610.pdf}
}