1. Duke-Elder S, Wybar KC. The eyelids. In: System of ophthalmology. Vol. II. The anatomy of the visual system. CV Mosby, St. Louis, MO. 1962; pp. 507
2. Duane, A. Protective organs (adnexa) of the eye. In: Fuch's textbook of ophthalmology. JB Lippincott, Philadelphia, PA. 1924; pp: 4
3. Bremer JL. A Textbook of Histology. Blakiston Co., Philadelphia, PA. 1944; pp. 644
4. Prince JH, Diesser, CD, Eglitis I, Ruskell GL. Anatomy and Histology of the Eye and Orbit in Domestic Animals. Charles C Thomas, Springfield, IL. 1960; pp. 154
5. Eglitis I. The glands. In: Prince JH (ed) The Rabbit in Eye Research. Charles C Thomas, Springfield, IL, 1964; pp. 33–37