1. The Performance of Heifers Got by Artificial Insemination;Robertson;J. Agr. Sci.,1954
2. Statistical Methods Applied to Experiments in Agriculture and Biology;Snedecor,1946
3. Wadell, L. H. Influence of Artificial Breeding on Production in Selected Michigan Dairy Herds. Unpublished U.S. thesis. Michigan State University Library, East Lansing. 1957.