1. Pigmentation and other criteria for the selection of laying hens;Blakeslee;Conn. (Storrs) Exp. Sta. Bul.,1917
2. Every Step in Culling and Breeding;Foreman,1922
3. The relation of some head characters and egg production among Cantonese fowls;Fronda;Phillipine Agr.,1931
4. Is there an egg-laying type in the domestic fowl?;Jull;Poul. Sci.,1933