Sirited, P., C. Kaowsoon, and C. Kongsin. “The result of knowledge development program and self-efficacy perception towards teenage pregnancy prevention in secondary school girls”. UBRU Journal for Public Health Research, vol. 9, no. 2, Dec. 2020, pp. 90-100, https://he02.tci-thaijo.org/index.php/ubruphjou/article/view/240577.