M. Jamzuri, N. Khayati, S. Widodo, E. Hapsari, and F. Haryanti, “Increasing Oxytocin Hormone Levels in Postpartum Mothers Receiving Oketani Massage and Pressure in The GB-21 Acupressure Point”, International Journal of Advancement in Life Sciences Research, vol. 2, no. 1, pp. 22-27, Jan. 2019.