Galton, Sir Francis; Spottiswoode, William; Markham, Sir Clements Robert, eds. (1863). "Twelfth Meeting, Monday Evening, 11 May 1869". Proceedings of the Royal Geographical Society of London. 7 (3). London: Royal Geographical Society: 108–110.
Burton, R. F. (14 November 1864). "Lake Tanganyika, Ptolemy's Western Lake-Reservoir of the Nile". Proceedings of the Royal Geographical Society of London. 9 (1). Blackwell Publishing: 6–14. doi:10.2307/1799295. JSTOR1799295.
Burton, R. F. (14 November 1864). "Lake Tanganyika, Ptolemy's Western Lake-Reservoir of the Nile". Proceedings of the Royal Geographical Society of London. 9 (1). Blackwell Publishing: 6–14. doi:10.2307/1799295. JSTOR1799295.