APA

Mayo Clinic staff. (October 10, 2008). Gamma-knife radiosurgery. Retrieved August 5, 2009, from http://www.mayoclinic.com/health/gamma-knife-radiosurgery/MY00206/METHOD=print

Mayo Clinic staff. "Gamma-Knife Radiosurgery.", October 10, 2008. Web. August 5, 2009.
< http://www.mayoclinic.com/health/gamma-knife-radiosurgery/MY00206/METHOD=print>.

Mayo Clinic staff. Gamma-knife radiosurgery. Available at: http://www.mayoclinic.com/health/gamma-knife-radiosurgery/MY00206/METHOD=print. Accessed August 5, 2009.