Hankey, A. 2013. Observation of Drimia sphaerocephala, Makobulaan Nature Reserve, Mpumalanga. https://www.inaturalist.org/observations/10879828.
http://pza.sanbi.org/references/hankey-2013-observation-drimia-sphaerocephala-makobulaan-nature-reserve-mpumalanga