Utaiwan Koktatong. (2000) Comparison of knowledge, attitude and skill in condom application in male vocational students. Mahidol University,:ม.ป.ท.Utaiwan Koktatong. 2000. Comparison of knowledge, attitude and skill in condom application in male vocational students. ม.ป.ท.:Mahidol University,;Utaiwan Koktatong. Comparison of knowledge, attitude and skill in condom application in male vocational students. ม.ป.ท.:Mahidol University, 2000. Print.