1. Armstrong, K.C.; Cleveland, R.W. (1970): Hybrids of Trifolium pratense × Trifolium pallidum. Crop Sci. 10, 354–357
2. Cincura, F. (1965): Cytotaxonomic evaluation of Trifolium sarosiense Hazsl. Biologia (Bratislava) 20, 300–305
3. Collins, G.B.; Phillips, G.C. (1981): In vitro tissue culture and plant regeneration in Trifolium pratense L. United States N.S.F. and France-C.N.R.S. Seminar on Plant Regeneration, Orsay, France, July, 1980 (in press)
4. Collins, G.B.; Vian, W.E.; Phillips, G.C. (1978): Use of 4-amino-3,5,6-trichloropicolinic acid as an auxin source in plant tissue cultures. Crop Sci. 18, 286–288
5. Dobzhansky, T. (1951): Genetics and the Origin of Species. New York: Columbia Univ. Press