1. The pattern of genetic and environmental variation in relation to ageing in laying hens;Engstrom;Genet. Sel. Evol.,1992
2. Guide to the care and use of experimental animals;Can. Counc. Anim. Care,1980
3. Heterosis. Pages 913–933 in: Poultry Breeding and Genetics;Fairfull,1990
4. Use of breed resources for poultry egg and meat production. Pages 242–256 in: Proceedings of the 3rd World Congress on Genetics Applied to Livestock Production;Fairfull,1986