1. Burt, A. W. A. , 1976: Proceedings of the XI. Poultry Science Symposium. Boorman, K. N. and Freeman, B. M. (Ed.), British Poultry Sci. Ltd., Edinburgh, 311 pp.
2. The Relative Value of Pellets versus Mash and Grain in Poultry Nutrition
3. Hamm, O. ; Jean, E. ; Tollett, J. ; Stephenson, E. L. , 1960: Arkansas Expt. Sta. Bull. No. 631.
4. Hill, J. A. ; Powell, A. J. ; Charles, D. R. , 1979: Proceedings of the XIV. Poultry Science Symposium. Boorman, K. N. and Freeman, B.M. (Ed.). British Poultry Sci., Ltd., Edinburgh, 231 pp.