1. Boster JS (1985) Selection for perceptual distinctiveness: evidence from aguaruna cultivars of Manihot esculenta. Econ Bot 39: 310–325
2. Brown WL, Goodman MM (1977) Races of corn. In: Sprague GF (ed) Soybeans: corn and corn improvement. Crop Sci Soc of America, Madison, WI, pp 49–88
3. Burtt-Davy J (1905) Report of the government agrostologist and botanist for the year ending June 30th 1904. Transvaal Department of Agriculture, Annual Report, pp 261–320. For the year 1903–04 see pp 263, 270–71, 274. 1 plate. Reprinted in part in the Rhodesian Agricultural Journal 3: 354, 364 (1906)
4. Carter TE Jr, Gizlice Z, Burton JW (1993) Coefficient of parentage and genetic similarity estimates for 258 North American soybean cultivars released by public agencies during 1954–88. USDA Tech Bull no 1814. US Gov Print Office, Washington, DC
5. Carter TE Jr, de Souza PI, Purcell LC (1999) Recent advances in breeding for drought and aluminum resistance in soybean. In: Kauffman H (ed) Proc World Soybean Conf VI: 106–125. Academic Press, London, 542 pp