1. The cells of bovine milk;Blackburn;J. Dairy Res.,1954
2. Mail and telephone surveys:the total design method;Dillman,1978
3. Eastridge, M. L. 1987. Ohio Dairy Herd Improvement summary for official herds. October, 1987. Ohio Coop. Ext. Publ., Columbus.
4. Management of dry cows to reduce mastitis;Eberhart;J. Dairy Sci.,1986
5. Herd management andprevalence of mastitis in dairy herds with high and low somatic cell counts;Erskine;J. Am. Vet. Med. Assoc.,1987