1. Analysis of Binary Data;Cox,1970
2. Die Valsdraadwurms (Coleoptera: Tenebrionidae) wat 'm Rol Speel by Mielieverbouing, met Spesiale Verwysing na die Biologie van Somaticus angulatus (Fahraeus);Drinkwater,1987
3. Laboratory trials on the systemic activity of insecticides against false wireworms, Somaticus species (Coleoptera: Tenebrionidae), attacking maize;Drinkwater;Phytophylactica,1989
4. The Interpretation of Quantal Responses in Biology;Hewlett,1979