1. Comparison of the incidence of udder infection and mastitis in two cow families;Murphy;Cornell Veterinarian,1944
2. Preliminary report on inheritance of “susceptibility” to severe udder infection (mastitis);Ward;New Zealand Jour. Sci. and Techn.,1938
3. Ward, A. H. and Castle, O. M. 1945. Investigation into field conditions associated with mastitis in a sample of 32 herds over a three-year period. (In) 21st Annual Report of the New Zealand Dairy Board.