References
- 1960 . Farming Today Is Big Business . Iowa Farm Bureau Spokesman , 27 Sept 17 : 2
- Animal Morbidity Report—Special Diseases Eradication Section Animal Disease Eradication Division, Agricultural Research Service, U.S. Department of Agriculture.
- 1960 . Farm Resident Accidents, 1959 . Farm Safety Rev. , 18 Sept.-Oct. : 5 Face the Facts