1. The Haugh unit for measuring egg quality;Haugh;U.S. Egg Poultry Mag.,1937
2. The yolk color index;Heiman;U.S. Egg Poult. Mag.,1935
3. Energy requirements of avian species;Leclercq,1975
4. Nutrient Requirements of Poultry,1984
5. Wheat middling as an alternate feedstuff for laying hens;Patterson;Poultry Sci.,1988