* {{en}} [http://pin.primate.wisc.edu/factsheets/links/trachypithecus Primate Info Net ''Trachypithecus'' Factsheets]refli
* {{en}} [http://animaldiversity.ummz.umich.edu/site/accounts/classification/Trachypithecus.html#Trachypithecus Genus Trachypithecus] dari refli ''Animal Diversity Web'', Museum Zoologi Universitas Michigan
