Herman, P. 2002. “The Plant Family Asteraceae: 4 Interesting Growth Forms and Economic Importance”. Suid-Afrikaans Tydskrif Vir Natuurwetenskap En Tegnologie / <i>South African Journal of Science and Technology</I&gt; 21 (3), 108-10. https://doi.org/10.4102/satnt.v21i3.235.