G. F. Smith and E. Figueiredo, “Reinstatement of Aloe verdoorniae (Asphodelaceae subfam. Alooideae), a distinctively purplish blue-leaved species of maculate aloe endemic to the eastern Gauteng and western Mpumalanga provinces of South Africa”, Phytotaxa, vol. 626, no. 2, pp. 110–118, Nov. 2023.