@book{161668,
	author = {American Petroleum Institute, API},
	title = {Equipment marking color-symbol system chart},
	publisher = {American Petroleum Institute, API},
	year = {1995},
	address = {Washington},
	edition = {2nd ed.},
	note = {Es un suplemento a la API RP 1637, segunda edición de 1995 reafirmada en el 2000}
}