Langi, F. F. G., and G. Langi. “Barriers to Delivery Care by Skilled Attendants in Sulawesi Utara”. Journal of Public Health and Development, vol. 7, no. 3, Dec. 2017, pp. 1-13, https://he01.tci-thaijo.org/index.php/AIHD-MU/article/view/104505.