1. Fisher, C., 1989. Use of models to describe biological function and to estimate nutrient requirements for poultry. Pages 52–63 in: Report of Proc. First European Symposium On EDP Applications in Poultry Management, WPSA Danish Branch, DSR Forlag, Copenhagen, Denmark.
2. Pettigrew, J.E., 1994. Variation in energy contribution of dietary nutrients. Pages 52–53 in: Proc. Intl. Post-graduate Course on Modeling Growth in Pigs, Agricultural University of Wageningen, The Netherlands.
3. Mathematical Models in Agriculture;France,1984
4. Nutrient Requirements of Poultry;National Research Council,1994
5. Feed and other costs of producing market eggs;Byerly,1941