A monograph of the Bucerotid, or family of the hornbills..[London]Published for the subscribers by the author [printed by Taylor and Francis]1882..biodiversitylibrary.org/page/38534747
Von der Decken's Hornbill (Tockus deckeni) in captivity at the Birds of Eden Park Free Flight Bird Sanctuary at Plettenberg Bay, South Africa. Photographed on 19 June 2012.Native of East Africa.www.inaturalist.org/observations/52636811
