Sosef, M. (1994). Refuge begonias: Taxonomy, phylogeny and historical biogeography of begonia sect. loasibegonia and sect. scutobegonia in relation to glacial rain forest refuges in Africa. Agricultural University.

Sosef, M.S.M. Refuge Begonias: Taxonomy, Phylogeny and Historical Biogeography of Begonia Sect. Loasibegonia and Sect. Scutobegonia in Relation to Glacial Rain Forest Refuges in Africa. Wageningen: Agricultural University, 1994.

Sosef, M.S.M. Refuge Begonias: Taxonomy, Phylogeny and Historical Biogeography of Begonia Sect. Loasibegonia and Sect. Scutobegonia in Relation to Glacial Rain Forest Refuges in Africa. Agricultural University, 1994.