Kanokporn Wattayakorn. 2007. Prevalence survey study of psychoactive drug use among drivers in Thailand. Field of Study Pharmacy Administration, Mahidol University;
Kanokporn Wattayakorn. (2007) Prevalence survey study of psychoactive drug use among drivers in Thailand . Mahidol University/Bangkok.
Kanokporn Wattayakorn. Prevalence survey study of psychoactive drug use among drivers in Thailand. . Bangkok:Mahidol University, 2007.
Kanokporn Wattayakorn. (2007) Prevalence survey study of psychoactive drug use among drivers in Thailand . Mahidol University/Bangkok.