Effendi, Fikry, Corrie Wawolumaja, Azrul Azwar, and Jusuf Misbach. “A Risk Prediction Model of the Incidence of Occupational Low Back Pain Among Mining Workers”. Medical Journal of Indonesia 20, no. 3 (August 1, 2011): 212–6. Accessed February 16, 2025. http://mji.ui.ac.id/journal/index.php/mji/article/view/455.