Geissmann, T.; Nijman, V. (2009). "Calling in Wild Silvery Gibbons (Hylobates moloch) in Java (Indonesia): Behavior, Phylogeny, and Conservation". American Journal of Primatology. 68 (1): 1–19. doi:10.1002/ajp.20203. PMID16419119. S2CID5900145.
Geissmann, T.; Nijman, V. (2009). "Calling in Wild Silvery Gibbons (Hylobates moloch) in Java (Indonesia): Behavior, Phylogeny, and Conservation". American Journal of Primatology. 68 (1): 1–19. doi:10.1002/ajp.20203. PMID16419119. S2CID5900145.
Geissmann, T.; Nijman, V. (2009). "Calling in Wild Silvery Gibbons (Hylobates moloch) in Java (Indonesia): Behavior, Phylogeny, and Conservation". American Journal of Primatology. 68 (1): 1–19. doi:10.1002/ajp.20203. PMID16419119. S2CID5900145.