Attributes / relations provided by
♦ ¹del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ ²The Diversity of Plants as Feed Resources for the Java Gibbon (Hylobates moloch), Grizzled Langur (Presbytis cornata), and Silver Langur (Trachypithecus auratus) In Gunung Halimun National Park, Wartika Rosa Farida and Harun, Jurnal Primatologi Indonesia, Vol. 3, No. 2, Desember 2000, p.:55-61