Christian Andreas, "The Spread and Impact of the Lungsickness Epizootic of 1853–57 in the Cape Colony and the Xhosa Chiefdoms", South African Historical Journal 53 no. 1 (2005): 50–72. doi:10.1080/02582470509464889
Jack Lewis, "Materialism and Idealism in the Historiography of the Xhosa Cattle-Killing Movement 1856–7", South African Historical Journal 25, no. 1 (1991): 244–268, doi:10.1080/02582479108671959.
jstor.org
J. B. Peires, "The Central Beliefs of the Xhosa Cattle-Killing", The Journal of African History 28, no. 1 (1987) JSTOR181448, p. 43.