1. Primary Sources (Cape Archives Repository / Kaapse Argief Bewaarplek [KAB])
2. Amptelike Publikasies van die Kaapkolonie / Official Publications of the Cape Colony (AMPT PUBS CCP)
3. Annexures to the Votes and Proceedings of the House of Assembly: Memorandum on the Working of the Guano Islands, 1893. AMPT PUBS, CCP1/2/1/85: G58.
4. Cape of Good Hope: Government Gazette: Proclamation no. 499: Rules and Regulations for the Protection of Seals and Seabirds, 27 December 1893.
5. Cape of Good Hope: Government Gazette, 5 July 1907.