^M. Källersjö, G. Bergqvist & A. A. Anderberg. Generic realignment in primuloid families of the Ericales s. l.: a phylogenetic analysis based on DNA sequences from three chloroplast genes and morphology. American Journal of Botany (American Journal of Botany, Vol. 87, No. 9). 2000, 87 (9): 1325–1341. JSTOR 2656725. PMID 10991903. doi:10.2307/2656725.