List of sources:
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National Automated Archival Information Retrieval System (NAAIRS). http://national.archives.gov.za/naairs.htm Documents relating to Sharley, George / Sharley, G.
Plug, C. Die Zuid-Afrikaansche Republiek se eerste staatsmuseum en wetenskaplike verenigings. South African Journal for Cultural History, 1991, Vol. 5, pp. 113-127.
Sharley of Heanor, Measham, Derbyshire. Retrieved from http://www.shirleyassociation.com/NewShirleySite/NonMembers/England/Lineages/Derbyshire_Heanor_SamuelShirley.html on 1 October 2020.
De Volksstem, 17 January 1874, p. 2; 7 February 1874, p. 2; 14 February 1874, p. 2; 6 June 1874, p. 1; 28 November 1874, p. 3; 23 January 1875, p. 3: Articles and advertisements relating to the Transvaal Literary and Scientific Society/ Transvaal Letterkundig en Wetenschappelijk Genootschap.