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Liebenberg, E.C. Die topografiese kartering van Suid-Afrika, 1879-1972; 'n histories-geografiese ontleding (p. 126). MA-verhandeling in geografie, Universiteit van Suid-Afrika, 1973.
Liebenberg, E. From Barrow to Jeppe - the development of 19th century cartography in South Africa. In E. Liebenberg (Ed.), Proceedings of the symposium on the history of cartography of Africa... (pp. 103-119). Pretoria: International Cartographic Association, 2003.
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