Moreira, F (2004). "Distribution patterns and conservation status of four bustard species (Family Otididae) in a montane grassland of South Africa". Biological Conservation. 118 (1): 91–100. Bibcode:2004BCons.118...91M. doi:10.1016/j.biocon.2003.07.011.
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Moreira, F (2004). "Distribution patterns and conservation status of four bustard species (Family Otididae) in a montane grassland of South Africa". Biological Conservation. 118 (1): 91–100. Bibcode:2004BCons.118...91M. doi:10.1016/j.biocon.2003.07.011.