Retief, F., and L. Cilliers. 2001. “Concepts of Inheritance in Graeo-Roman Times”. Suid-Afrikaans Tydskrif Vir Natuurwetenskap En Tegnologie / <i>South African Journal of Science and Technology</I&gt; 20 (3/4), 94-100. https://doi.org/10.4102/satnt.v20i3/4.256.