List of sources:
Chemical, Metallurgical and Mining Society of South Africa. Journal, 1904/5, Vol. 5 and 1908, Vol. 9; Proceedings, 1903, Vol. 3, list of members.
Geological Society of South Africa. Transactions, 1906, Vol. 10, and 1915, Vol. 18: Lists of members.
Hall, A.L. Bibliography of South African geology to the end of 1920. Pretoria: Geological Survey, Memoir No. 18, 1922.
National Archives Repository, Pretoria (TAB). Source MHG, Reference 73709. Estate documents, Burton Ireland Collings.
South African who's who, 1908.
general election, 1924. In Wikipedia: The
Free Encyclopedia. Retrieved from https://en.wikipedia.org/wiki/Southern_Rhodesian_general_election,_1924
Southern Rhodesian Legislative Council election,
1914. In Wikipedia: The Free
Encyclopedia. Retrieved from https://en.wikipedia.org/wiki/Southern_Rhodesian_Legislative_Council_election,_1914