@book{199971,
	author = {Larson. Henrietta M.},
	title = {History of Humble Oil & Refining Company:},
	publisher = {Ayer Company Publishers,},
	year = {1993},
	address = {New Hampshire, },
	edition = {1ra. ed.},
	note = {Reimpresión de 1993 con permiso de Harper & Row}
}