1. Revised American Dental Association specification no. 12 for denture base material, acrylic resin or mixtures of acrylic and other resins (effective January 1, 1942);J.A.D.A.,1942
2. Low temperature polymerization of acrylic resins;Taylor;J. D. Res,1950
3. A multipurpose photoelectric reflectometer;Hunter;J. Res. NBS,1940
4. Colorimetry;Judd,1950
5. Colors of polystyrene plastics. Commercial Standards, CS 156-49. Washington, D. C., U. S. Government Printing Office.