1. Snell R, Lemp M. Clinical anatomy of the eye. 2nd ed. Malden, MA: Blackwell; 1998.
2. Price KM, Richard MJ. The tearing patient: diagnosis and management, Ophthalmic Pearls, Eyenet Magazine, June 2009. Accessed 23/08/2020: https://www.aao.org/eyenet/article/tearing-patient-diagnosis-management
3. Anijeet D, Dolan L, Macewen CJ. Endonasal versus external dacryocystorhinostomy for nasolacrimal duct obstruction. Cochrane Database Syst Rev. 2011;1:CD007097.
4. Maguire J, Murchison A, Jaeger E. Wills eye institute 5-minute ophthalmology consult. 1st ed. Philadelphia, PA: Lippincott, Williams & Wilkins; 2012.
5. Hausheer J. Basic techniques of ophthalmic surgery. 2nd ed. San Francisco, CA: American Academy of Ophthalmology; 2015.