1. Foster CS, Azar DT, Dohlman CH . The Cornea: Scientific Foundations and Clinical Practice, 4th ed. Lippincott Williams and Walters: Philadelphia, PA, 2005.
2. Yanoff M, Duker JS . Ophthalmology, 2nd ed. Elsevier Publications: Philadelphia, PA, USA, 2008.
3. Buratto L, Phillipe RL, Carito G . Pterygium Surgery Chapter on. SLACK Incorporated, Thorofare Publications: New Jersey, NJ, 2000.
4. Saw SM, Tan D . Pterygium: prevalence, demography and risk factors. Ophthalmic Epidemiol 1999; 6: 219–228.
5. Reid TW, Dushku N . Does human papillomavirus cause pterygium? Br J Ophthalmol 2003; 87: 806–808.