Yulviana, R., and Intan Widya Sari. “The Effectiveness of Pregnant Exercise Against Anxiety Levels in Promigravida Pregnant Women at Pratama Deliana Clinic Pekanbaru”. Journal of Midwifery and Nursing, vol. 3, no. 1, Jan. 2021, pp. 16-19, https://iocscience.org/ejournal/index.php/JMN/article/view/1147.