Nurlisis, N. 2012. Maternal Factors that Influence Abnormal Parturition at Arifin Achmad Hospital Riau Province. Jurnal kesehatan komunitas (Journal of community health). 2, 1 (Nov. 2012), 14–19. DOI:https://doi.org/10.25311/keskom.Vol2.Iss1.36.