Nilprasert, H., K. Chamroonsawasdi, P. Charupoonphol, and P. Khajornchaikul. “Predictive factors on family planning practice to prevent repeated pregnancy among teenage mothers in Prachuab Khiri Khan Province”. Thai Journal of Health Education, vol. 44, no. 2, Nov. 2021, pp. 47-63, https://he01.tci-thaijo.org/index.php/muhed/article/view/245378.