1. Abbott, U. K., and R. M. Craig. Notes for Avian Embryology Projects. Department of Poultry Husbandry, University of California, Davis, Calif.
2. Early Social Isolation as a Determinant of Aggressive Behavior in the Domestic Chicken.;Baron;J. Comp. Physiol. Psychol.,1960
3. Bradley, O. C., and T. Grahame. The Structure of the Fowl. 4th Edition.
4. Poultry Production.;Card,1966
5. Preparing an Avian Skeleton for Mounting. Poultry General Science Project.;Cole,1963