Umpava Timpan. (2005) Sexuality of male adolescents : a case study of urban male adolescents at risk to sexual behavior in Chiang Mai province. Mahidol University,:ม.ป.ท.Umpava Timpan. 2005. Sexuality of male adolescents : a case study of urban male adolescents at risk to sexual behavior in Chiang Mai province. ม.ป.ท.:Mahidol University,;Umpava Timpan. Sexuality of male adolescents : a case study of urban male adolescents at risk to sexual behavior in Chiang Mai province. ม.ป.ท.:Mahidol University, 2005. Print.