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- Print of original document
- Wording for body of document corroborated by Worger, William H. (2010) [2001]. Africa and the West: A Documentary History. Volume 1: From the slave trade to conquest, 1441–1905 (Second ed.). Oxford: Oxford University Press. p. 241. ISBN 978-0-19-537313-4.
- Wording for Helm's endorsement corroborated by Keppel-Jones, Arthur (1983). Rhodes and Rhodesia: The White Conquest of Zimbabwe, 1884–1902. Montreal, Quebec and Kingston, Ontario: McGill-Queen's University Press. p. 78. ISBN 978-0-7735-0534-6.
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