1. Cady, R. A., R. D. Anderson, and L. D. Van Vleck. 1978. Evaluation of sires for calving difficulty. Page 96 in Genetics research. 1977-78 Rep. Eastern AI Coop.
2. Cady, R. A., and L. D. Van Vleck. 1979. Evaluation of bulls for calving difficulty. Page 74 in Genetics research. 1978-79 Rep. Eastern AI Coop.
3. Evaluation of Holstein bulls for dystocia using a categorical analysis;Cady;J. Dairy Sci.,1979
4. Relationships between the proposed uniform type system and the official Guernsey and Jersey classification programs;Dickinson;J. Dairy Sci.,1979
5. Selection index and expected genetic advance;Henderson,1963