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 (Sep. 2004), 35-41. DOI:https://doi.org/10.4102/satnt.v23i1/2.191.