Hoang, Thach Mai, and Herbert H. Covert. “New Records of Home Range of Tonkin Snub-Nosed Monkey (Rhinopithecus Avunculus Dollman, 1912) in Khau Ca Forest, Ha Giang Province”. Academia Journal of Biology 32, no. 3 (May 9, 2012): 26–30. Accessed May 4, 2024. https://vjs.ac.vn/index.php/vjbio/article/view/701.