@book{135068,
	author = {American Gas Association, AGA},
	title = {Natural gas glossary},
	year = {2002},
	address = {Washington},
	note = {Sitio revisado el día 29/05/02 ; Navegadores de Internet},
	url = {http://www.aga.org/Content/NavigationMenu/About_Natural_Gas/Natural_Gas_Glossary/Natural_Gas_Glossary_(A).htm}
}