W. J. Rizal, Y. Yulizawati, H. Hardisman, F. Firdawati, and R. S. Rita, “Narative Review The Effect of Endorphin Massage and Counter Pressure During Labor On Endorphin Hormone Release”, women midwives & midwifery, vol. 4, no. 2, pp. 56-72, Jul. 2024.