@book{152243,
	author = {National Fire Protection Association and American Gas Association, AGA},
	title = {National fuel gas code},
	publisher = {International Approval Services},
	year = {2002},
	address = {Ohio},
	note = {Para las referencias 8.3.7, 8.3.7.1 y 8.3.7.2 contiene una tentativa de enmienda de 2003}
}