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Pratiwi Suci Triadi A. Effectivity of Information Services in Preventing Bullying at MTs Madinatussalam, Percut Sei Tuan District, Deli Serdang Regency. IJESSM [Internet]. 2021Mar.23 [cited 2024Nov.22];1(3):34-4. Available from: https://lpppipublishing.com/index.php/ijessm/article/view/17