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♦ ¹The 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
♦ ²"Habitat Use and Trophic Niche Overlap of Two Sympatric Colobines, Presbytis potenziani and Simias concolor, on Siberut Island, Indonesia", Susilo Hadi, Thomas Ziegler, Matthias Waltert, Fauzan Syamsuri, Michael Mühlenberg, J. Keith Hodges, Int. J. Primatol. (2012) 33:218–232