List of sources:
Bibliography of
regional meteorological literature. Vol. 1. Southern Africa, 1486-1948
(Compiled by R.J. Venter). Pretoria: Weather Bureau, 1949.
Cape of Good Hope. Civil
service list, 1906, 1910.
FamilySearch: William Martin Watt. https://www.familysearch.org/en/tree/person/details/G4HN-LZW
National Union
Catalogue, pre-1956 imprints. London: Mansell, 1968-1980.
Scott, H. Fasti
ecclesiae scoticanae. The succession
of ministers in the Church of Scotland from the reformation. New ed. (Vol.
5, p. 339, Hugh George Watt). Edinburgh: Oliver and Boyd, 1925. Retrieved on 21 April 2021 from https://books.google.co.za/books?id=EAcWAwAAQBAJ&pg=PA339&lpg=PA339&dq=William Martin Watt fasti ecclesiae&source=bl&ots=ORaOEYprtU&sig=ACfU3U3FWjan1K7l8c3RGLkDVNB4r9RViQ&hl=en&sa=X&ved=2ahUKEwjNyPOsjo_wAhXL-6QKHWy1CSMQ6AEwEHoECAUQAw#v=onepage&q=William Martin Watt fasti ecclesiae&f=false
Southern Rhodesia. Report
of the Director of Agriculture, 1911, 1912, 1913, 1914.