1. Abberton, M.T., and Marshall, A.H. 2005. Progress in Breeding Perennial Clovers for Temperate Agriculture. J. Agric. Sci. 143:117–135.
2. Akerberg, E., Bingefors, S. and Lesins, K. 1947. About present-day problems of red clover and lucerne breeding for Middle Sweden. (in Swedish, original title: Nagra aktuella problem inom förädlingen med rödklöver och lusern för Mellansverige). Sveriges Utsädesföreningen Tidskrift 57, pp. 200–229.
3. Berg, C.C. and Leath, K.T. 1996. Responses of Red Clover Cultivars to Stemphylium Leaf Spot. Crop Sci. 36:71–73.
4. Berthaut, J. 1968. The use of nitrous oxide in creating autotetraploid varieties in red clover (Trifolium pratense L.). (in French, original title: L’emploi du protoxyde d’azote dans la création de variétés autotétraploides chez le trèfle violet (Trifolium pratense L.)). Annales d’Amélioration des Plantes 18, pp. 381–390.
5. Bingefors, S. 1951. Studies on breeding red clover for resistance to stem nematodes, Volume 8 of Växtödling – Plant Husbandry. Almqvist & Wiksells Boktrykeri AB, Uppsala, Sweden.