Wilms, T., Wagner, P., Luiselli, L., Branch, W.R., Penner, J., Baha El Din, S., Beraduccii, J., Msuya, C.A., Howell, K. & Ngalason, W.: Varanus niloticusIUCN Red List of Threatened Species. Version 2022-1. 2021. International Union for Conservation of Nature, IUCN, Iucnredlist.org. Viitattu 23.8.2022. (englanniksi)