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[Dale, L.] Stone implements in South Africa. Cape Monthly Magazine, new series, 1870, Vol. 1, pp. 236-239.
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Jones (Mr. Justice). Some evidence of primitive man. E.P. Magazine, 1893, Vol. 2(1), pp. 1-16.
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Mitford-Barberton, I. & Mitford-Barberton, R. The Bowkers of Tharfield. Oxford University Press, 1952.
National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to Thomas Holden Bowker / T.H. Bowker.
Thomas Holden Bowker. http://1820settlers.com/genealogy/getperson.php?personID=I160&tree=master