1. Alefeld, F. 1866. Landwirtschaftliche Flora. Berlin.
2. Anonymous. 1957. New vegetable varieties. List IV. Proc Amer. Soc. Hort. Sci. 69: 574–587.
3. Bailey, L. H. 1929. The domesticated cucurbitas. Gentes Herb. 2: 62–115.
4. —. 1937. The Garden of Gourds. Macmillan, New York.
5. Carter, G. F. 1945. Plant Geography and Culture History in the American Southwest. Viking Fund Publ. in Anthropol. No. 5, New York.