1. The Early Story of Glass, Part I;Gasson;The Optician,1968
2. Modern Ophthalmic Lenses and Optical Glass;Obrig,1935
3. Spectacle Glass Technology;Horne,1978
4. The Early Story of Glass, Part II;Gasson;The Optician,1968
5. Optometry: Professional, Economic and Legal Aspects;Hofstetter,1948