Worawan Tipwareerom และ Arpaporn Powwattana. (2010) Risky sexual behavior prevention program among adolescent boys. Mahidol University:ม.ป.ท.Worawan Tipwareerom และ Arpaporn Powwattana. 2010. Risky sexual behavior prevention program among adolescent boys. ม.ป.ท.:Mahidol University;Worawan Tipwareerom และ Arpaporn Powwattana. Risky sexual behavior prevention program among adolescent boys. ม.ป.ท.:Mahidol University, 2010. Print.