Purwanto, N. H., L. N. Aini, and F. Purwanto. “MENURUNKAN INTENSITAS NYERI PADA PENDERITA LOW BACK PAIN MELALUI TERAPI WILLIAM FLEXION EXERCISE”. Jurnal Bhakti Civitas Akademika, Vol. 7, no. 2, July 2024, pp. 59-72, https://e-journal.lppmdianhusada.ac.id/index.php/jbca/article/view/368.