Surangrat Khosittanasarn. (2005) The effectiveness of sex education program on prevention of undesirable sexual behaviors among grade 8 female students in Nakhonrachasima. Mahidol University,:ม.ป.ท.Surangrat Khosittanasarn. 2005. The effectiveness of sex education program on prevention of undesirable sexual behaviors among grade 8 female students in Nakhonrachasima. ม.ป.ท.:Mahidol University,;Surangrat Khosittanasarn. The effectiveness of sex education program on prevention of undesirable sexual behaviors among grade 8 female students in Nakhonrachasima. ม.ป.ท.:Mahidol University, 2005. Print.