Botha, Christiaan Edward Johannes. Rhodes University, Grahamstown; 1989. Plants - yesterday, today, tomorrow? : inaugural lecture delivered at Rhodes University.

Saheed, Sefiu Adekilekun, Botha, Christiaan Edward Johannes, Liu, Lin, Jonsson, Lisbeth M V. Comparison of structural damage caused by Russian wheat aphid (Diuraphis noxia Mordvilko) and Bird cherry-oat aphid (Rhopalosiphum padi L.) in a susceptible barley cultivar, Hordeum vulgare L. cv Clipper. 2007.