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2. Observations on Reproductive Processes in Dairy Cattle and Their Relation to Breeding Efficiency;Casida;Proc. Am. Soc. Anim. Prod.,1936
3. Length of Service Period in Relation to Productive and Reproductive Efficiency in Dairy Cows;Chapman;Proc. Am. Soc. Anim. Prod.,1935
4. Heritability of the Length of the Gestation Period in Dairy Cattle;DeFries;J. Dairy Sci.,1959
5. Estimates of Producing Ability in Dairy Cattle;Dickerson;J. Agr. Res.,1940