Hamidah Sari Batubara, Rika Sri Wahyuni, and Andriani Andriani. “The Relationship Between Smartphone Usage and Student Achievement at SMP 21 Pekanbaru”. International Journal of Public Health Excellence (IJPHE) 4, no. 1 (July 7, 2024): 064–069. Accessed September 1, 2024. https://ejournal.ipinternasional.com/index.php/ijphe/article/view/917.