“PENGARUH WILLIAM FLEXION THERAPY TERHADAP NYERI PUNGGUNG BAWAH MAHASISWA DI UNIVERSITAS ‘AISYIYAH SURAKARTA”. 2022. OVUM : Journal of Midwifery and Health Sciences 2 (2): 55-64. https://doi.org/10.47701/ovum.v2i2.2363.