@book{176714,
	author = {Petróleos Mexicanos and Zarazúa Muciño, Humberto, comp. and Petróleos Mexicanos},
	title = {El petroleo  /},
	publisher = { Petróleos Mexicanos,},
	year = {1972},
	address = {México  :},
	edition = {12a ed.}
}