Devi Dwi Rianti, Emilia, Wahyuni Dyah Parmasari, and Ayly Soekanto. “THE HEAVY LOAD OF THE BACKPACK ON THE SHOULDER POSITION AT THE AGE OF 12-15 YEARS AT SMPN 56 SURABAYA”. BIOMA : Jurnal Ilmiah Biologi 13, no. 1 (April 20, 2024): 29–35. Accessed November 15, 2024. https://journal2.upgris.ac.id/index.php/bioma/article/view/375.