Taxonomy and systematics Dark-capped bulbul

^ common bulbul (pycnonotus barbatus) . fishpool, l. & tobias, j. (2017). in: del hoyo, j., elliott, a., sargatal, j., christie, d.a. & de juana, e. (eds.). handbook of birds of world alive. lynx edicions, barcelona. retrieved 11 november 2017. 
^ pycnonotus tricolor - avibase . avibase.bsc-eoc.org. retrieved 2017-03-27. 
^ bulbuls « ioc world bird list . www.worldbirdnames.org. retrieved 2017-03-27.