W, M. N., Irmawati, I., & Wijayati, S. (2015). Hypnosis, Massage Relaxation, Endorphins And Pain Intensity First Stage of Normal Delivery Primapara BPS Semarang. Jurnal Riset Kesehatan, 1(2), 106–110. https://doi.org/10.31983/jrk.v1i2.376