Mavianti, M. Harun, R. A. Putri, W. S. Agustin, and P. Andreani, “Efforts to Manage the Hidden Heaven of the World in Pamah Semelir Langkat-North Sumatra”, Indones. J. Community Serv. Cel, vol. 1, no. 1, pp. 42–48, Apr. 2022.