Coburn, F. D. (1907). Alfalfa, lucerne, Spanish trefoil, Chilian clover, Brazilian clover, French clover, medic, purple medic -- (Medicago sativa): Practical information on its production, qualities, worth and uses, especially in the United States and Canada. Orange Judd Co..
Chicago-referens (17:e uppl.)Coburn, F. D. Alfalfa, Lucerne, Spanish Trefoil, Chilian Clover, Brazilian Clover, French Clover, Medic, Purple Medic -- (Medicago Sativa): Practical Information on Its Production, Qualities, Worth and Uses, Especially in the United States and Canada. New York: Orange Judd Co., 1907.
MLA-referens (8:e uppl.)Coburn, F. D. Alfalfa, Lucerne, Spanish Trefoil, Chilian Clover, Brazilian Clover, French Clover, Medic, Purple Medic -- (Medicago Sativa): Practical Information on Its Production, Qualities, Worth and Uses, Especially in the United States and Canada. Orange Judd Co., 1907.