Arisumi, T. 1964. Interspecific hybridization in African Violets. J. Hered. 55: 181-182.

Burtt, B.L. 1958. Studies in the Gesneriaceae of the Old World. XV: The genus Saintpaulia. Notes Roy. Bot. Gard. Edinburgh 22: 547-568.

Burtt, B.L. 1964. Studies in the Gesneriaceae of the Old World. XXV: Additional notes on Saintpaulia. Notes Roy. Bot. Gard. Edinburgh 25: 191-196.

Clarke, G.P. 1998. Plants in Peril, 24: Notes on Lowland African Violets (Saintpaulia) in the Wild. Curtis’s Botanical Magazine 15(1): 62-67.

Clayberg, C.D. 1961.  Hybridizing with the African Violet Species.  African Violet Magazine 14:105-107.

Christenhusz, M. J. M. 2012. On African violets and Cape primroses – towards a monophyletic Streptocarpus (Gesneriaceae). Phytotaxa 46: 3-9.

Darbyshire I. 2006. Gesneriaceae. Flora of tropical East Africa. Kew: Royal Botanic Gardens.

Eastwood, A., Bytebier, B., Tye, H., Tye, A., Robertson, A. & Maunder, M. 1998. The conservation status of Saintpaulia. – Curtis’s Botanical Magazine 15: 49-62.

Engler, A. 1900: Gesneriaceae. – Botanische Jahrbücher 28(4): 481-483, Tab. 5-7.

Engler, A. 1921: Gesneriaceae africanae, IV. – Botanische Jahrbücher 57: 202-204.

Haston, E.M., J. Mejissa, and C. Watkins. 2009. Two New Species of Saintpaulia from the Uluguru Mountains, Tanzania.  Curtis’s Bot. Mag. 26(3): 270-272.

Johansson, D. R. 1978.  Saintpaulias in their natural environment with notes on their present status in Tanzania and Kenya. Biological Conservation 14: 45-62.

Kolehmainen. J.K. and P. Mutikainen. 2006. Reproductive ecology of three endangered African violet (Saintpaulia H. Wendl.) species in the East Usambara Mountains, Tanzania. African J. of Ecology 44(2): 219-227.

Linqvist, C. & Albert, V. A. 1999. Phylogeny and conservation of African violets (Saintpaulia: Gesneriaceae): new findings based on nuclear ribosomal 5S non-transcribed spacer sequences. – Kew Bulletin 54: 363-377.

Linqvist, C. & Albert, V. A. 2001.  A high elevation ancestry for the Usambara Mountains and lowland populations of African violets.  Syst. Geogr. Pl. 71: 37-44.

 Martins, D.J. 2008. Pollination Observations of the African Violet in the Taita Hills, Kenya. J. of East African Natural History. 97(1): 33-42.

Möller, M. and Q.C.B. Cronk. 1997a. Origin and Relationships of Saintpaulia (Gesneriaceae) based on Ribosomal DNA Internal Transcribed Space (ITS) Sequences. Amer. J. of Botany 84(7): 956–965.

Möller, M. and Q.C.B. Cronk. 1997b. Phylogeny and disjunct distribution: evolution of Saintpaulia (Gesneriaceae). Proc. R. Soc. Lond. B. 264: 1827-1836.

Möller, M. & Cronk, Q. C. B. 1999: New approaches to the systematics of Saintpaulia and Streptocarpus. In: Andrews, S., Leslie, A.C. & Alexander, C. (eds.): Taxonomy of Cultivated Plants: Third Symposium, pp. 253-264. Royal Botanic Gardens, Kew.

Nishii, K., M. Hughes, M. Briggs, E. Haston, F. Christie, M.J. DeVillers, T. Hanekom, W.G. Roos, D.U. Bellstedt and M. Möller. 2015. Streptocarpus redefined to include all Afro-Malagasy Gesneriaceae: Molecular phylogenies prove congruent with geographical distribution and basic chromosome numbers and uncover remarkable morphological homoplasies.  Taxon 64(6):1243-1274.

Rousos, P.A. 1981. A study of Intergeneric crossing between selected species of the genera Streptocarpus and Saintpaulia. Master’s Thesis. George Mason University.