@book{20,
	author = {Celis Salgado, Lourdes},
	title = {La Industria Petrolera en México. Una Crónica :},
	publisher = {PEMEX,},
	year = {1988.},
	address = {México :},
	edition = {1a. Ed.},
	note = {50 Aniversario PEMEX}
}