- www.revoptom.com/handbook/sect6b.htm
- www.revoptom.com/handbook/sect6i.htm
- www.revoptom.com/handbook/SECT51a.HTM
- www-personal.umd.umich.edu/~jcthomas/JCTHOMAS/1997%20Case%20Studies/D%20Berro.html
- The Eye Clinic Disease Information Optic Neuritisofcn.org/cyber.serv/hwp/hwc/eye/information/disease/optic-neuritis.html