- Hilliard, O. M. and Burtt B. L. (1971) Streptocarpus, An African Plant Study. University of Natal Press, Pietermaritzburg, South Africa.
- Möller, M., and Cronk, Q.C.B. (1997) Origin and Relationships of Siantpaulia (Gesneriaceae) based on ribosomal DNA internal transcribed spacer (ITS) sequences. American Journal of Botany, 84 (7); 956 – 965.
- Hughes, M., M. Möller, D.U. Bellstedt, T.J. Edwards and M. de Villiers (2005) Refugia, dispersal and divergence in a forest archipelago: a study of Streptocarpus in eastern South Africa. Molecular Ecology 14, 4415-4426