1. Brooks. Clifford .W. and Borish. Irvin M. :System for ophthalmic Dispensing,2th, Butterworth-Heinemann ,1996

 2. Brooks. Clifford .W. : Essentionals for opthalmic lens work , 1st , Fairchild , 1983

 3. Millodot. Michel : Dictionary of optometry and visual science

 4. Keeney,Hagman,Fratello. :Dictionary of ophthalmic Optics

 5. OLA : core of knowledge Training Manual , unit 3&4