1. Miller NR, Walsh FB, Hoyt WF. Walsh and Hoyt's Clinical Neuro-Ophthalmology. Pennsylvania, United States: Lippincott Williams & Wilkins; 2005
2. Zhang J, Rubin R, Rao N. Anatomy and Embryology of the Optic Nerve: Duane’s Foundations of Clinical Ophthalmology. Philadelphia: Lippincott Williams & Wilkins; 2005. pp. 1-10
3. Mikelberg FS, Drance SM, Schulzer M, Yidegiligne HM, Weis MM. The normal human optic nerve: Axon count and axon diameter distribution. Ophthalmology. 1989;96(9):1325-1328
4. Remington LA. Clinical Anatomy of the Visual System. Butterworths-Heinemann. Oxford, United Kingdom: Elsevier Health Sciences; 2011
5. Adler FH, Kaufman PL, Levin LA, Alm A. Adler's Physiology of the Eye. Saunders. Philadelphia, United States: Elsevier Health Sciences. 2011