Solongo และ Algaa. (2000) The factors affecting premarital sex among in-school adolescents in Mongolia. Mahidol University,:ม.ป.ท.Solongo และ Algaa. 2000. The factors affecting premarital sex among in-school adolescents in Mongolia. ม.ป.ท.:Mahidol University,;Solongo และ Algaa. The factors affecting premarital sex among in-school adolescents in Mongolia. ม.ป.ท.:Mahidol University, 2000. Print.