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Zhou, J.; F. Wei, M.; Lok, C. B. P.; Wang, D.; Wang, Deli (2008). "Reproductive characters and mating behaviour of wild Nomascus hainanus". International Journal of Primatology. 29 (4): 1037–1046. doi:10.1007/s10764-008-9272-7. S2CID35519035.
Zhou, J.; Wei, F.; Li, M.; Zhang, J. F.; Wang, D.; Pan, R. L. (2005). "Hainan black-crested gibbon is headed for extinction". International Journal of Primatology. 26 (2): 453–465. doi:10.1007/s10764-005-2933-x. S2CID41663138.