References
- Gillett, J. B. (1952). The genus Trifolium in Southern Arabia and in Africa south of the Sahara. Kew Bull. 1952, 367–404.
- It Mannetje, L. (1964). The use of some African clovers as pasture legumes in Queensland. Aust. J. Exper. Agric. Anim. Husb., 4, 22–5.
- Norris, D. O., and 't Mannetje, L. (1964). The symbiotic specialization of African Trifolium species in relation to their taxonomy and their agronomic use. E. Afr. agric. for. J., 29, 214–35.
- Osborne, D. V. (1963). A numerical representation for taxonomic keys. New Phytol. 62, 35–43.