1. Clark, C. F. and P. M. Lombard. 1951. Descriptions of and key to American potato varieties. U.S.D.A. Circular No. 741.
2. Kotila, John E. 1929. Some bud mutations of the potato. Amer. Potato Jour. 6: 131–135.
3. Krantz, F. A. and R. M. Bailey. 1931. Recent contributions to potato breeding and related subjects. Amer. Potato Jour. 8: 154–158.
4. Miller, Julian C. 1936. Further studies of mutations of the Porto Rico sweet potato. Proc. of A.S.H.S. Vol. 33.
5. Stuart, William. 1937. The Potato. J. B. Lippincott Company.