Putri, S. A. D. M. M., A. Kristiyanto, and H. Prasetya. “Meta-Analysis the Effectiveness of McKenzie Exercise to Reduce Pain in Patients With Non-Specific Low Back Pain”. Journal of Epidemiology and Public Health, vol. 6, no. 1, July 2021, pp. 33-41, https://www.jepublichealth.com/index.php/jepublichealth/article/view/363.