Richard S. Cowan et Frans A. Stafleu, Taxonomic literature, vol. 5, Utrecht, Bohn, Scheltema & Holkema, (ISBN9789031302246, lire en ligne), chap. 1985
books.google.com
R. Moffett, A Biographical Dictionary of Contributors to the Natural History of the Free State and Lesotho, SUN MeDIA Bloemfontein, (ISBN978-1-920382-34-6, lire en ligne), p. 263
librarything.com
« Famous People & Personalities - Part 20 - The Green Dragon », sur LibraryThing, (consulté le ) : « Institute legend has it that the editing had to be quite severe, as otherwise it would have made history as the only government publication ever to be banned by the same government, on account of the salty names of many South African plants. »