Deb, P., P. K. Rai, and P. C. Bhattacharjee. “A Review on the Distribution of Western Hoolock Gibbon (Hoolock Hoolock) in Northeast India”. Journal of Research in Biology, Vol. 4, no. 3, June 2014, pp. 1301-10, https://ojs.jresearchbiology.com/ojs1/index.php/jrb/article/view/343.