Gunn, Mary (1981). Botanical exploration of southern Africa : an illustrated history of early botanical literature on the Cape flora : biographical accounts of the leading plant collectors and their activities in southern Africa from the days of the East India Company until modern times. L. E. W. Codd. Cape Town: Published for the Botanical Research Institute by A.A. Balkema. p. 47. ISBN0-86961-129-1. OCLC8591273.
