Boles, W. (2020). del Hoyo, J.; Elliott, A.; Sargatal, J.; Christie, D.A.; de Juana, E. (ur.). »Blue-capped Ifrita (Ifrita kowaldi)«. Birds of the World. 1.0. Ithaca, NY, USA: Cornell Lab of Ornithology. doi:10.2173/bow.bucifr1.01. {{navedi splet}}: Manjkajoč ali prazen |url= (pomoč)
Dumbacher, J.P.; in sod. (2004). »Melyrid beetles (Choresine): A putative source for the batrachotoxin alkaloids found in poison-dart frogs and toxic passerine birds«. PNAS. 101 (45): 15857–15860. doi:10.1073/pnas.0407197101.
