Damanik, Lisa Putri Utami, and Sri Ratu Alam. “The Effect of Pregnancy Gymnastics on Reducing Pain on The Backs of Pregnant Women in the Practice of Independent Midwives Sri Ratu Alam Batam City in 2022 ”. Science Midwifery, vol. 10, no. 4, Oct. 2022, pp. 3391-4, doi:10.35335/midwifery.v10i4.828.