@book{37349,
	author = {Nelson, W. L. and Fombona, Gustavo Thery},
	title = {Petróleos crudos de Venezuela y otros países.},
	publisher = {Min.de Minas e Hidrocarburos,},
	year = {1959.},
	address = {Caracas :},
	edition = {2da. ed.}
}