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pubmed.ncbi.nlm.nih.gov
McKenzie, Robert J.; Muller, Elizabeth M.; Skinner, Amy K.W.; Karis, Per Ola; Barker, Nigel P. (2005). "Phylogenetic relationships and generic delimitation in subtribe Arctotidinae (Asteraceae: Arctotideae) inferred by DNA sequence data from ITS and five chloroplast regions". American Journal of Botany. 93 (8): 1222–1235. doi:10.3732/ajb.93.8.1222. PMID21642186.