Bibliography
- Newell FW, Ernest JT. Ophthalmology: principles and concepts. 3rd ed. St Louis: CV Mosby. 1974
- Schele HG, Albert DM. Adler's textbook of ophthalmology. 8th ed. Philadelphia: WB Saunders. 1969
- Vaughan D, Asbury T. General ophthalmology. 7th ed. Los Altos. CA: Lange Medical Publications. 1974