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Allan, David G.; Harrison, James A.; Navarro, RenéA.; van Wilgen, Brian W.; Thompson, Mark W. (1997-02-01). ”The impact of commercial afforestation on bird populations in Mpumalanga Province, South Africa — Insights from bird-atlas data”. Biological Conservation 79 (2): sid. 173–85. doi:10.1016/S0006-3207(96)00098-5. ISSN0006-3207.
Raihani, Gina; Székely, Tamás; Serrano-Meneses, M. Alejandro; Pitra, Christian; Goriup, Paul (2006-04-01). ”The influence of sexual selection and male agility on sexual size dimorphism in bustards (Otididae)”. Animal Behaviour 71 (4): sid. 833–838. doi:10.1016/j.anbehav.2005.06.013. ISSN0003-3472.
Knight, Richard S.; Macdonald, I. A. W. (1991-08-01). ”Acacias and korhaans: an artificially assembled seed dispersal system”. South African Journal of Botany 57 (4): sid. 220–225. doi:10.1016/S0254-6299(16)30942-5. ISSN0254-6299.
Shaw, Jessica M.; Jenkins, Andrew R.; Allan, David G.; Ryan, Peter G. (2016). ”Population size and trends of Ludwig's Bustard Neotis ludwigii and other large terrestrial birds in the Karoo, South Africa” (på engelska). Bird Conservation International 26 (1): sid. 69–86. doi:10.1017/S0959270914000458. ISSN0959-2709.