Sirirat Saesieo และ Apitep Saekow. (2015) Factors affecting decision making on purchasing pearl milk tea in Bangkok. Stamford International University:ม.ป.ท.Sirirat Saesieo และ Apitep Saekow. 2015. Factors affecting decision making on purchasing pearl milk tea in Bangkok. ม.ป.ท.:Stamford International University;Sirirat Saesieo และ Apitep Saekow. Factors affecting decision making on purchasing pearl milk tea in Bangkok. ม.ป.ท.:Stamford International University, 2015. Print.