References
- Costenbader, Frank D.: Factors in the Cure of Squint, In James H. Allen, ed., Strabismus Ophthalmic Symposium, St. Louis, C. V. Mosby, 1950, p. 368.
- Katzin, Herbert M., and Wilson, Geraldine: Rehabilitation of a Child's Eyes, St. Louis, C. V. Mosby, 1961, p. 61.