↑ Note: Some scientists and sources claims that the population size is overestimated, since it was based on studies in the northern parts only, where the gibbons tend to crowd. (Source: REPORT 4, Frontier Cambodia 2010, p.4)
↑ Traeholt, C., Bonthoeun, R., Rawson, B., Samuth, M., Virak, C., and Sok Vuthin 2005. Status review of pileated gibbon, Hylobates pileatus, and yellow-cheeked crested gibbon, Nomascus gabriellae, in Cambodia, FFI Cambodia Programme Office, Phnom Penh
