Nofri Wandi Al Hafiz, and M. Hasim Siregar. “GEOGRAPHIC INFORMATION SYSTEMS FOR THE DISTRIBUTION OF COMMUNITY SERVICE ACTIVITIES IN KUANTAN SINGINGI DISTRICT”. INFOKUM, Vol. 10, no. 1, Dec. 2021, pp. 236-43, http://seaninstitute.org/infor/index.php/infokum/article/view/257.