1. Becker, T., 1951. Siebenjährige blutenbiologische Studien an den Cruciferae Brassica napus L. Brassica oleracea L., Raphanus L. und Sinapis L. Z. PflZücht. 31: 72–103.
2. Boswell, V. R., 1949. Our vegetable travelers. Natn. Geogr. Mag. 46 (2): 145–217.
3. Boyd, A. G. & I. A. Dickson, 1966. Fodder radish or rape. Agriculture, Lond., 73 (5): 217–22.
4. Caspari, E., 1948. Cytoplasmic inheritance. Adv. Genet. 2: 1–66.
5. Clausen, J., D. D. Keck & W. M. Hiesey, 1945. Experimental studies on the nature of species. II. Plant evolution through amphidiploidy and autoploidy, with examples from the Madiinae. Carnegie Inst. Washington, Publ. No. 564, 174 pp.