1. Standard method for visual evaluation of color differences of opaque materials;ASTM,1974
2. Standard method of specifying color by the Munsell system;ASTM,1980
3. Chromatophores and color change: a comparative physiology of animal pigmentation;Baonara,1973
4. The biochemistry of natural pigments;Britten,1983
5. Chromatophores and color change;Brown,1973