Promwong, U., Suthutvoravut, S., Patrachai, S. and Singhakajen, V. (2010) “Factors Associated with Pregnancy among Primigravida Adolescents at King Chulalongkorn Memorial Hospital”, Research Medical Journal, 33(4), pp. 236–241. available at: https://he02.tci-thaijo.org/index.php/ramajournal/article/view/152225 (accessed: 20 September 2026).