1. Aemro M.(2019).Ecology of common hippopotamus (Hippopotamus amphibious) and conflict incidence with human around Chebera Churchura National Park Ethiopia(PhD thesis). Addis Ababa University.
2. Données biologiques, eco‐ethologiques et socio economiques sur les groupes d'hippopotames (Hippopotamus amphibius) isoles isolés dans les terroirs villageois en zones humides des departements départements du Mono et du Couffo au SudBenin;Amoussou K. G.;Bulletin de la Recherche Agronomique du Bénin,2006
3. Astey S.(1991).Large mammals distribution in Liberia. Report to World Wide Fund International (Unpublished).
4. Assessment of Crop Damage by Protected Wild Mammalian Herbivores on the Western Boundary of Tadoba-Andhari Tiger Reserve (TATR), Central India
5. Blowers E. T.(2008).Social grouping behaviours of captive female Hippopotamus amphibius(MSc thesis). University of Central Florida Orlando.