Collar, N. J.; Robson, C. (2016). "Scimitar-babblers and allies". In del Hoyo, J.; Elliott, A.; Sargatal, J.; Christie, D. A.; de Juana, E. (eds.). Handbook of the Birds of the World. Vol. Volume 2: Passerines. Barcelona: Lynx Edicions. {{cite book}}: |volume= has extra text (help)