List of sources:
Family Search: George Edward Bell Frood. https://www.familysearch.org/ark:/61903/1:1:FQ5V-FSM and https://www.familysearch.org/ark:/61903/1:1:6ZH1-KWMV and https://www.familysearch.org/ark:/61903/1:1:4D8Z-4GZM
Frood, G.E.B. and Hall, A.L. The nitrate occurrences in the districts of Prieska and Hay, Cape Province. Pretoria: Geological Survey, Memoir No. 14, 1919.
Hall, A.L. A bibliography of South African geology to the end of 1920. Pretoria: Geological Survey, Memoir No. 18, 1922.
National Automated Archival Information Retrieval System (NAAIRS), at http://www.national.archives.gov.za/naairs.htm Documents relating to George Edward Bell Frood / G.E.B. Frood.
South African Association for the Advancement of Science. Report, 1918, list of members.
Union of South Africa. Official Year Book of the Union. Pretoria: Government Printer, 1918. Pp. 449-457:Article on "Diamonds" by Frood and Trevor.
Union of South Africa. Public Service List, 1914. Pretoria: Government Printer, 1914.