• Bogdan, A. Y. (1966). Pollination and breeding behaviour in the Trifolium rueppellianum complex in Kenya. New Phytol., 65, 417.
  • Britten, E. J. (1963). Chromosome numbers in the genus Trifolium. Cytologia, 28, 428.
  • Gillett, J. B. (1952). The genus Trifolium in southern Arabia and Africa south of the Sahara. Kew Bull., 1952, 367.
  • Joffe, A. (1962). Photoperiodism in relation to the origin of African Trifolium species. Nature. Lond., 195, 1117.
  • Koningsberger, V. J. (1963). Inleiding tot de Plantenphysiologie, 2, Scheltema and Holkema N.V., Amsterdam .
  • Mannetje, L. t (1964). The use of some African clovers as pasture legumes in Queensland. Aust. J. exp. Agric. Anim. Husb., 4, 22.
  • Norris, D. O. (1956). Legumes and the Rhizobium symbiosis. Emp. J. exp. Agric, 24, 247.
  • Norris, D. O. & Mannetje, L. T. (1964). The symbiotic specialization of African Trifolium spp. in relation to their taxonomy and their agronomic use. E. Afr. agric. For. J., 29, 214.
  • Pritchard, A. J. (1962). Number and morphology of chromosomes in African species in the genus Trifolium L. Aust. J. agric. Res., 13, 1023.
  • Pritchard, A. J. & Mannetje, L. T. (1967). The breeding systems and interspecific relations of some African Trifolium spp. Euphytica. (In press).
  • Strange, R. (1958). Preliminary trials of grasses and legumes under grazing. E. Afr. agric. J., 24, 92.