Prapasri Poopayang และ Somsak Suthutvoravut. (2014) Factors associated with adolescent pregnancy in rural district of Kalasin province, Thailand. Mahidol University:ม.ป.ท.Prapasri Poopayang และ Somsak Suthutvoravut. 2014. Factors associated with adolescent pregnancy in rural district of Kalasin province, Thailand. ม.ป.ท.:Mahidol University;Prapasri Poopayang และ Somsak Suthutvoravut. Factors associated with adolescent pregnancy in rural district of Kalasin province, Thailand. ม.ป.ท.:Mahidol University, 2014. Print.