Santosa, Y. , Rahman, D. , Wulan, C. , Mustari, A.. "Calculation of a Sustainable Quota Harvesting of Long-Tailed Macaque (Macaca fascicularis Raffles) in Their Natural Habitats". World Academy of Science, Engineering and Technology, Open Science Index 104, International Journal of Agricultural and Biosystems Engineering, (2015), 9(8), 946 - 952.