Purba R, Lubis RK. Sosialisasi E- Commerce Bagi Remaja Melalui Media Speaking Activity Di MTSN 1 Deli Serdang. JPkMN [Internet]. 2020Sep.29 [cited 2025Nov.7];1(1):1-13. Available from: http://ejournal.sisfokomtek.org/index.php/jpkm/article/view/44