Viboon Wattananamkul. 2006. Gift exchange and "Si" in pharmaceutical representative and physician relationships. Field of Study Medical and Health Social Sciences, Mahidol University;
Viboon Wattananamkul. (2006) Gift exchange and "Si" in pharmaceutical representative and physician relationships . Mahidol University/Bangkok.
Viboon Wattananamkul. Gift exchange and "Si" in pharmaceutical representative and physician relationships. . Bangkok:Mahidol University, 2006.
Viboon Wattananamkul. (2006) Gift exchange and "Si" in pharmaceutical representative and physician relationships . Mahidol University/Bangkok.