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2. American Academy of Ophthalmology. 2014-2015 Basic and Clinical Science Course. Section 2: Fundamentals and Principles of Ophthalmology. San Francisco, CA: American Academy of Ophthalmology; 2014. pp. 44-45
3. American Academy of Ophthalmology. 2014-2015 Basic and Clinical Science Course. Section 8: External Disease and Cornea. San Francisco, CA: American Academy of Ophthalmology; 2014. p. 74
4. Robertson DM, Alexander LJ, Bonanno JA, Fleiszig SMJ, McNamara N. Cornea and ocular surface disease: Application of cutting edge optometric research. Optometry and Vision Science: Official Publication of the American Academy of Optometry. 2014;91(401):S3-16. DOI: 10.1097/OPX.0000000000000226
5. American Academy of Ophthalmology. 2014-2015 Basic and Clinical Science Course. Section 8: External Disease and Cornea. San Francisco, CA: American Academy of Ophthalmology; 2014. p. 9