R. R. Klopper, O. M. Grace, A. W. Klopper, G. F. Smith, and A. E. V. Wyk, “A taxonomic revision of Aloe sect. Purpurascentes (Asphodelaceae subfam. Alooideae)”, Phytotaxa, vol. 628, no. 1, pp. 1–64, Nov. 2023.