List of sources:
Cape of Good Hope. Report of the Surveyor-General, 1886.
General directory of South Africa, 1908, 1909, 1910, 1911.
Liebenberg, E.C. Die topografiese kartering van Suid-Afrika, 1879-1972; 'n histories-geografiese ontleding (pp. 176-177). MA-verhandeling in geografie, Universiteit van Suid-Afrika, 1973.
National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to Gilfillan, William Heathcote/Gilfillan, W.H.
Personal communication from Craig Hilton-Taylor, Manager of Red List Unit, IUCN, Cambridge, United Kingdom, 2009-8-31.
South African Association for the Advancement of Science. Report, 1903, 1905/6, lists of members.
Transvaal Civil Service List, 1906.
Transvaal [Colony], Colonial Secretary's Department. Annual Report for the year ended 30 June 1904.
Transvaal [Colony], Department of Agriculture. Report for 1902/3.
Transvaal [Colony]. Transvaal Administration Reports for 1902, pp. I.1-3: Pretoria Museum and Zoological Gardens.
Transvaal Museum. Annual Report, 1905/6, 1906/7.
Transvaal public service list, 1909.
University of the Cape of Good Hope. Calendar 1884/5.
William Heathcote Gilfillan. Retrieved from http://www.1820settlers.com/genealogy/getperson.php?personID=I5385&tree=master
on 2017-1-17.