Prasad, Sashank. "Visual Migraine"(PDF). Brigham and Women's Hospital. Harvard Medical School. Archived from the original(PDF) on 18 March 2015. Retrieved 4 October 2016.
Prasad, Sashank. "Visual Migraine"(PDF). Brigham and Women's Hospital. Harvard Medical School. Archived from the original(PDF) on 18 March 2015. Retrieved 4 October 2016.