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Sha, J. C. M.; Gumert, M. D.; Lee, B. P. Y-H.; Fuentes, A.; Rajathurai, S.; Chan, S.; Jones-Engel, L. (2009). "Status of the long-tailed macaque Macaca fascicularis in Singapore and implications for management". Biodiversity and Conservation. 18 (11): 2909–2926. Bibcode:2009BiCon..18.2909S. doi:10.1007/s10531-009-9616-4. S2CID44216913.