1. Contact Lenses: A Clinical Approach to Fitting, 2nd ed.;Hales,1982
2. Contact Lens Practice, 4th ed.;Mandell,1988
3. Contact Lenses in Ophthalmology.;Wilson,1988
4. Contact Lens Practice.;Wesley,1953
5. Theory and Practice of Contact Lens Fitting.;Jenkin,1964