Krissana Chuenjit. (1997) A study of smoke-free programs in Bangkok secondary male schools. Mahidol University,:ม.ป.ท.Krissana Chuenjit. 1997. A study of smoke-free programs in Bangkok secondary male schools. ม.ป.ท.:Mahidol University,;Krissana Chuenjit. A study of smoke-free programs in Bangkok secondary male schools. ม.ป.ท.:Mahidol University, 1997. Print.