Brochmann, Christian; Gizaw, Abel; Chala, Desalegn; Kandziora, Martha; Eilu, Gerald; Popp, Magnus; Pirie, Michael D.; Gehrke, Berit (). „History and evolution of the afroalpine flora: in the footsteps of Olov Hedberg”. Alpine Botany. Springer Science and Business Media LLC. 132 (1): 65–87. doi:10.1007/s00035-021-00256-9. ISSN1664-2201.
White, F.; Unesco; Association pour l'étude taxonomique de la flore d'Afrique tropicale; United Nations Sudano-Sahelian Office (). Vegetation of Africa : a descriptive memoir to accompany the Unesco/AETFAT/UNSO vegetation map of Africa. Paris: Unesco. ISBN92-3-101955-4. OCLC10387142.
Brochmann, Christian; Gizaw, Abel; Chala, Desalegn; Kandziora, Martha; Eilu, Gerald; Popp, Magnus; Pirie, Michael D.; Gehrke, Berit (). „History and evolution of the afroalpine flora: in the footsteps of Olov Hedberg”. Alpine Botany. Springer Science and Business Media LLC. 132 (1): 65–87. doi:10.1007/s00035-021-00256-9. ISSN1664-2201.