von Sicard, Harald (December 1946). "The tree cult in the Zimbabwe culture". African Studies. 5 (4): 257–267. doi:10.1080/00020184608706722.
J. Mataga & F.M. Chabata (2012). "The Power of Objects: Colonial Museum Collections and Changing Contexts". The International Journal of the Inclusive Museum. 4 (2): 81–94 p. 83 footnote 3. doi:10.18848/1835-2014/CGP/v04i02/44370.