@book{141352,
	author = {American Petroleum Institute, API},
	title = {Specification for wellhead and Christmas tree Equipment},
	publisher = {American Petroleum Institute, API},
	year = {2018},
	address = {Washington},
	edition = {21a. Ed.},
	note = {Incluye: Errata 1, abril 2019 Errata 2, junio 2020 Errata 3, septiembre 2020 Adenda 1, julio 2020 Adenda 2, junio 2021}
}