List of sources:
Argus annual and Cape of Good Hope directory, 1892-1894: East London Natural History Society.
Buekes, Susan (great-granddaughter). Personal communication, August-September 2020, including family documents and photos.
Cape of Good Hope. Report of the Government Botanist and Curator of the Cape Government Herbarium, 1896.
Eastern Province Naturalists' Society. Ninth annual report... for the year 1890, list of members. Port Elizabeth: James Kemsley, 1891.
General directory and guide book to the Cape of Good Hope and its dependencies, 1886.
Gunn, M. & Codd, L.E. Botanical exploration of southern Africa. Cape Town: Balkema, 1981.
National Automated Archival Information Retrieval System (NAAIRS). http://national.archives.gov.za/naairs.htm Documents relating to Wormald, William Henry / Wormald, W.H.
Personal communication from Dr Keith Tankard, Department of History, Rhodes University (East London), 30 January 1992.
South African Association for the Advancement of Science. Report for 1918 (published 1919), list of members.