Songpon Ratanapan. 1995. Caffeine drink consumption behavior of male workers and laborers in Bangkok. Faculty of Graduate Studies, Mahidol University;
Songpon Ratanapan. (1995) Caffeine drink consumption behavior of male workers and laborers in Bangkok . Mahidol University/Bangkok.
Songpon Ratanapan. Caffeine drink consumption behavior of male workers and laborers in Bangkok. . Bangkok:Mahidol University, 1995.
Songpon Ratanapan. (1995) Caffeine drink consumption behavior of male workers and laborers in Bangkok . Mahidol University/Bangkok.