Gyldenstolpe, N. 1934. The travels and collections of Johan August Wahlberg, 1810-1836: a pioneer naturalist in South Africa. Ibis 1934: 264-292, pl. 8.
The travels and collections of Johan August Wahlberg, 1810-1836: a pioneer naturalist in South Africa
Kenya Wildlife Service 2025. Kenya rhino range expansion as catalysts of a wildlife economy. KWS Wild Magazine no. 4: 1-4.
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Kenya Wildlife Service 2025. National Wildlife census 2025 technical report (abridged version) (. Naivasha, Wildlife Research and Training Institute. pp. 1-163.