Manning, J.C., Peter Goldblatt, and L. Joubert. “A Taxonomic Revision of the Small Cape Genus Steirodiscus (Asteraceae: Senecioneae)”. Bothalia, African Biodiversity & Conservation 43, no. 1 (January 13, 2013). Accessed February 7, 2025. https://abcjournal.org/index.php/BothaliaABC/article/view/208.