1. Sykes, W. H. (1834). Catalogue of birds of the raptorial and insessorial orders (systematically arranged), observed in the Dakhan. Journal of the Asiatic Society of Bengal III(32):418–423.
2. Rasmussen, P. C., and J. C. Anderton (2005): Birds of South Asia: The Ripley Guide. Vols. 1 and 2. Smithsonian Institution and Lynx Edicions, Washington, D. C. and Barcelona.
3. Ali, S., and S. D. Ripley (1996). Handbook of the Birds of India and Pakistan: Together with those of Bangladesh, Nepal, Bhutan and Sri Lanka. Volume 6. 2nd edition. Oxford University Press, Delhi, India.
4. Fishpool, L., and J. Tobias (2005). Family Pycnonotidae (Bulbuls). In Handbook of the Birds of the World, Volume 10, Cuckooshrikes to Thrushes (J. del Hoyo, A. Elliot, and D. Christie, Editors). Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, United Kingdom.
5. Himalayan black bulbuls (Hypsipetes leucocephalus niggerimus) exhibit sexual dichromatism under ultraviolet light that is invisible to the human eye