List of sources:
Arnold Wilhelm Spilhaus. Geni. Retrieved on 15 November 2020 from https://www.geni.com/people/Arnold-Wilhelm-Spilhaus-b1/6000000019135716971
Barton, E.S. A provisional list of the marine algae of the Cape of Good Hope. Journal of Botany, 1893, Vol. 31, pp. 53-56, 81-84, 110-114, 138-144, 171-177, 202-210 (see p. 207-208).
Dictionary of South African biography, Vol. 4, 1981.
Gunn, M. & Codd, L.E. Botanical exploration of southern Africa. Cape Town: Balkema, 1981.
List of members of the Botanical Society. Journal of the Botanical Society of South Africa. Retrieved on 15 November 2020 from https://journals.co.za/content/veld/5/1/AJA00423203_1475
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Retrieval System (NAAIRS). http://national.archives.gov.za/naairs.htm Documents relating to Arnold Wilhelm Spilhaus.
National Union Catalogue, pre-1956 imprints. London: Mansell, 1979.
South African who's who, 1919/1920.