Pornphan Viroonpinyo. 2009. Factors influencing consumers' decision to purchase paracetamol. Bangkok:Thammasat University;

Pornphan Viroonpinyo. Factors influencing consumers' decision to purchase paracetamol. Bangkok:Thammasat University, 2009.

Pornphan Viroonpinyo. (2009) Factors influencing consumers' decision to purchase paracetamol (รายงานผลงานวิจัย). Thammasat University:Bangkok.