Erwanto, E. L. (2016) “Effect of Spontaneous Delivery and Elective Caesarean Section on Number of Bifidobacterium Colony in Newborns”, Indonesian Journal of Obstetrics and Gynecology, 35(2). Available at: https://www.inajog.com/index.php/journal/article/view/222 (Accessed: 21 February 2026).