@book{131962,
	author = {International Association of Drilling Contractors, IADC},
	publisher = {International Association of Drilling Contractors, IADC},
	year = {2001},
	note = {Sitio visitado en julio 2001 ; Navegadores de Internet ; Adobe Acrobat (PDF)},
	url = {http://www.iadc.org/espanol/index.html}
}