Template:Kemp & Delport, 2002
- Kemp, A.C.; Delport, W. 2002: Comments on the status of subspecies in the red-billed hornbill (Tockus erythrorhynchus) complex (Aves: Bucerotidae), with the description of a new taxon endemic to Tanzania. Annals of the Transvaal Museum 39: 1–8. Full article (PDF) on African Journal Archive