VITRIANI, O.; HARAHAP, J.; NOVANCE, P. DECREASED BACK PAIN IN TRIMESTER III PREGNANT WOMEN DUE TO PREGNANCY EXERCISE IN SIDOMULYO HEALTH CENTER OF PEKANBARU IN 2019. JURNAL IBU DAN ANAK, v. 8, n. 1, p. 53-59, 1 jun. 2020.