Rookmaaker, L.C. 2011. A review of black rhino systematics proposed in Ungulate Taxonomy by Groves and Grubb (2011) and its implications for rhino conservation. Pachyderm 50: 72-76.
A review of black rhino systematics proposed in Ungulate Taxonomy by Groves and Grubb (2011) and its implications for rhino conservation
Ghika, N.D. 1897. Cinq mois au pays des Somalis, suivie de la faune somalie et d’une liste des plantes decrites par G. Schweinfurth et G. Volkens. Bale et Geneve, Georg et Co. pp. i-vi, 1-223.
PDF download available
Cornely, E. 1908. L’Album du petit voyageur illustré. Paris, Edouard Cornely & Cie. pp. 1-24.