1. Machine sorts eggs for shell color;Brant;Poult. Process. Marketing,1953
2. Color and color relative properties. Publication Number 010;Gardener Laboratory Inc.,1976
3. Shell color as a measure of egg shell quality;Godfrey;Poultry Sci.,1949
4. On measuring egg shell color in poultry breeding and selection programs;Gowe;Poultry Sci.,1965
5. Instruction Manual for Hunter Lab Tristimulus Colorimeter;Hunter Associates Laboratory Inc.,1981