S. Mulyani, R. Baharuddin, D. K. P. Sidiq, and A. Anandyawati, “Mapping Location of The Former Land of The Unlicensed Gold Mining (Ugm) in A Several Subdistricts in Kuantan Singingi District”, TERRA, vol. 3, no. 1, pp. 27–31, Jun. 2020.