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Erskine, Vincent W. (1869). "Journey of Exploration to the Mouth of the River Limpopo". The Journal of the Royal Geographical Society of London. 39: 233–276. doi:10.2307/1798552. JSTOR1798552.
C.Michael Hogan, Mark L. Cooke and Helen Murray, The Waterberg Biosphere, Lumina Technologies, May 22, 2006. "Lumaw". Archived from the original on 24 March 2007. Retrieved 23 December 2006.
C.Michael Hogan, Mark L. Cooke and Helen Murray, The Waterberg Biosphere, Lumina Technologies, May 22, 2006. "Lumaw". Archived from the original on 24 March 2007. Retrieved 23 December 2006.