Decken, Carl Claus von der; Kersten, Otto; Metcalf Collection (North Carolina State University). NCRS; Tippmann Collection (North Carolina State University). NCRS (1 January 1869). "Baron Carl Claus von der Deckens reisen in Ost-Afrika in den jahren 1859 bis 1865". Leipzig und Heidelberg : C.F. Winter'sche Verlagshandlung – via Internet Archive.
biodiversitylibrary.org
BHL Taxonomic literature : a selective guide to botanical publications