1. The relationship of the keel bone to egg production;Asmundson;Sci. Ag.,1921
2. Pigmentation and other criteria for the selection of laying hens;Blakeslee;Conn. (Storrs) Agr. Exp. Sta. Bul.,1917
3. Principles and Methods of Statistics;Chaddock,1925
4. Methods of Correlation Analysis;Ezekiel;Chapman and Hall.,1930
5. Every step in culling and breeding;Foreman,1922