1. Opthalmology: Principles and Concepts;Newell,1974
2. The Eye and Its Disorders;Trevor-Roper,1974
3. General Opthalmology;Vaughan,1974
4. Use-Abuse theory of changes in refraction vs biologic theory;Brown;Arch Ophthal. N.Y.,1942
5. A review of the major theories for the genesis of refractive state;Morgan,1967