@book{21,
	author = {Ruiz Naufal, Víctor M.},
	title = {La Industria Petrolera en México. Una Crónica :},
	publisher = {PEMEX,},
	year = {1988.},
	address = {México :},
	edition = {1a. Ed.},
	note = {50 Aniversario PEMEX}
}