1. Beard C, Quickert M. Anatomy of the orbit. second ed. Birmingham, AL: Aesculapius Publishing Company; 1977. p. 15–7.
2. Bedrossian EH Jr. The lacrimal system. In: Tasman W, Jaeger E, editors. Foundations of clinical ophthalmology, vol. 1. Philadelphia: Lippincott; 1996. p. 1–16.
3. Jones LT. Anatomy of the tear system. Int Ophthalmol Clin. 1973;13:3.
4. Jones LT, Wobig JL. Surgery of the eyelids and lacrimal system. Birmingham, AL: Aesculapius Publishing; 1976. p. 7–9. 67-70
5. Tanenbaum M, McCord C Jr. Lacrimal drainage system. In: Tasman W, Jaeger EA, editors. Duane’s ophthalmology, Vol. 4. Philadelphia: Lippincott Williams & Wilkins; 2007.