Smith, G.F. 2020.

Aloe ×retiefii (Asphodelaceae subfam. Alooideae), a new nothospecies from northeastern South Africa, with A. globuligemma and A. marlothii as parents

. Phytotaxa. 468, 1 (Oct. 2020), 150–154. DOI:https://doi.org/10.11646/phytotaxa.468.1.12.