Fishpool, Lincoln; Tobias, Joseph (2005). "Family Pycnonotidae (Bulbuls)". In del Hoyo, Josep; Elliott, Andrew; Christie, David (eds.). Handbook of the Birds of the World. Volume 10, Cuckoo-shrikes to Thrushes. Barcelona: Lynx Edicions. pp. 247–248. ISBN84-87334-72-5.