Anggraini, D., and T. S. Hardjanti. “EFFECTS OF HEGU POINT SUPPRESSOR (LI 4) AND BIRTH BALL TECHNIQUE ON LABOR PAIN: A REVIEW”. Proceedings of the International Conference on Applied Science and Health, no. 4, Aug. 2019, pp. 451-8, https://publications.inschool.id/index.php/icash/article/view/665.