Herman, P. (2004). The plant family Asteraceae: 6. The subfamily Asteroideae. Suid-Afrikaans Tydskrif Vir Natuurwetenskap En Tegnologie / <i>South African Journal of Science and Technology</I&gt;, 23(1/2), 35-41. https://doi.org/10.4102/satnt.v23i1/2.191