Helmut Richard Tölken: New taxa and a new combination in the genus Cotyledon. In: Bothalia. Band 12, Ausgabe 2, S. 194, 1977 (PDF).
biodiversitylibrary.org
W. H. Harvey: In: Flora capensis :being a systematic description of the plants of the Cape colony, Caffraria, & Port Natal. Band 2, Dublin 1861–1862, S. 373 (online).
