Chirawatkul, S., Kumdee, B., Jongudomkarn, D., Kotanara, I., Sawangchareon, K., Rujiraprasert, N., Yigusang, R., Maungpil, S., Rungreongkulkij, S., Wtananugoonkiat, S., Chareonwong, S., Anusornterakuland, S. and Kittiwatpisarn, W. 2017. Situation of Teenage Pregnancy: Perception among Adolescents in 7 Provinces of Thailand. Journal of Health Science of Thailand. 21, 5 (Dec. 2017), 865–877.