Rafif Himawan Nimasdwi Putra et al. 2025. PERBEDAAN PENGARUH PEMBERIAN WILLIAM FLEXION EXERCISE DAN ISOMETRIC EXERCISE TERHADAP PENINGKATAN KEMAMPUAN FUNGSIONAL PADA PENDERITALOW BACK PAIN NON SPESIFIK. Journal of Innovation Research and Knowledge. 5, 5 (Oct. 2025), 5937–5944. DOI:https://doi.org/10.53625/jirk.v5i5.11445.