Robert Inger, Indraneil Das, Robert Stuebing, Maklarin Lakim, Paul Yambun: Barbourula kalimantanensisIUCN Red List of Threatened Species. Version 2014.2. 2008. International Union for Conservation of Nature, IUCN, Iucnredlist.org. Viitattu 4.8.2014. (englanniksi)