@book{160987,
	author = {Oklahoma Marginal Well Commission and Oklahoma Marginal Well Commission},
	title = {Pumper's Manual},
	address = {Oklahoma},
	note = {Sitio visitado en junio de 2004 ; Navegadores de Internet ; Adobe Acrobat (PDF)},
	url = {http://www.marginalwells.com/MWC/pumper_manual.htm}
}