“PENGARUH WILLIAM FLEXION THERAPY TERHADAP NYERI PUNGGUNG BAWAH MAHASISWA DI UNIVERSITAS ‘AISYIYAH SURAKARTA”. OVUM : Journal of Midwifery and Health Sciences, vol. 2, no. 2, Oct. 2022, pp. 55-64, https://doi.org/10.47701/ovum.v2i2.2363.