L. H., Bailey (1925). Manual of cultivated plants: A flora for the identification of the most common or significant species of plants grown in the continental United States and Canada, for food, ornament, utility, and general interest, both in the open and under glass. Macmillan Publishers. ASINB00085D7ZC.
Hyde Bailey, Liberty; Zoe Bailey, Ethel (January 1, 1949). Hortus Second a Concise Dictionary of Gardening, General Horticulture and Cultivated Plants in North America. MacMillan & Company. ASINB000YT68Y4.
doi.org
Spencer & Cross 2007 Spencer, Roger D.; Cross, Robert G. (2007). "The International Code of Botanical Nomenclature (ICBN), the International Code of Nomenclature for Cultivated Plants (ICNCP), and the cultigen". Taxon. 56 (3): 938–940. doi:10.2307/25065875. JSTOR25065875.
Spencer & Cross 2007 Spencer, Roger D.; Cross, Robert G. (2007). "The International Code of Botanical Nomenclature (ICBN), the International Code of Nomenclature for Cultivated Plants (ICNCP), and the cultigen". Taxon. 56 (3): 938–940. doi:10.2307/25065875. JSTOR25065875.