1. Carter, G. F. Plant geography and culture history in the American Southwest.
2. Erwin, A. T. A rare specimen ofZea mays var.saccharata. Ia. Agr. Exp. Sta., Jour., Pap. No.J146. 1933.
3. Hedrick, U. P. History of horticulture in America to 1860. p. 10. 1950.
4. Lindstrom, E. W. Some new mutants in maize. Iowa State Coll., Jour. Sci.9(3): 451–59. 1935.
5. Sturtevant, L. E. Transactions of the New York Agricultural Society. p. 57. 1879.