• [Wiki] http://en.wikipedia.org/wiki/Symphalangus_syndactylus.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Symphalangus_syndactylus.
• [ADW] http://animaldiversity.ummz.umich.edu/accounts/Symphalangus_syndactylus/.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [Rile2008] Riley, R. W. (2008). Husbandry manual for siamang Hylobates syndactylus. Technical report, Western Sydney Institute of TAFE, Richmond.