Wikipedia.org Vasectomy Info
http://en.wikipedia.org/wiki/Vasectomy
WebMD Vasectomy Info
http://www.webmd.com/sex/birth-control/vasectomy-14387
Mayo Clinic Vasectomy Info
http://www.mayoclinic.com/health/vasectomy/MY00483
MedlinePlus Vasectomy Info
http://www.nlm.nih.gov/medlineplus/ency/article/002995.htm