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Somyat Kumpala. 2001. Factors related to substance use of American adolescents. Field of Study Demography, Mahidol University;
Somyat Kumpala. (2001) Factors related to substance use of American adolescents . Mahidol University/Bangkok.
Somyat Kumpala. Factors related to substance use of American adolescents. . Bangkok:Mahidol University, 2001.
Somyat Kumpala. (2001) Factors related to substance use of American adolescents . Mahidol University/Bangkok.