1. Hooker, W. J., C. E. Peterson, and R. G. Timian. 1954. Virus X resistance in potato. Amer. Potato Jour. 31: 199–212.
2. Krantz, F. A. 1924. Potato breeding methods. Minn. Agr. Exp. Sta. Tech. Bull. 25.
3. - and A. E. Hutchins. 1929. Potato breeding methods II. Selections in inbred lines. Minn. Agr. Exp. Sta. Tech. Bull. 58.
4. -. 1945. Potato breeding methods. III. A suggested procedure for potato breeding. Minn. Agr. Exp. Sta. Tech. Bull. 173.
5. —. 1951. Potato breeding in the United States. Z. Pflanzenzucht 29: 388–393.