List of sources:
Cape of Good Hope. Report of the Surveyor-General, 1884.
FamilySearch: Andrew Henry Farrell Duncan. https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSS4-591F-N?view=index&personArk=/ark:/61903/1:1:QPZM-LB7H&action=view and https://www.familysearch.org/ark:/61903/1:1:DH3D-82PZ
Google scholar. http://scholar.google.co.za Publications by A.H.F. Duncan.
Liebenberg, E.C. Die topografiese kartering van Suid-Afrika, 1979-1972; 'n histories-geografiese ontleding. MA-verhandeling in Geografie, Universiteit van Suid-Afrika, 1973.
Matabele War medal
awarded to A.H.F. Duncan. https://www.google.co.za/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=Andrew Henry Farrell Duncan
as on 2016-9-12.
National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to Duncan, A.H.F.
Transvaal Colony. Civil service list, 1906.
University of the Cape of Good Hope. Calendar, 1884/5.
Willson, F.M.G. and Passmore, G.C. Holders of administrative and ministerial office, 1894-1964.... Salisbury: University College of Rhodesia and Nyasaland, Department of Government, Source Book No. 3, 1966.