Narunan Wuttisin และ Daraphan Sangziw and Wipada Chaiya. (2017) Survey of Collagen Dietary Supplement Consumption in Chiang Rai Province. <i>Journal of Community Development and Life Quality</i>, <i>5</i>(2), 282-308.Narunan Wuttisin และ Daraphan Sangziw and Wipada Chaiya. "Survey of Collagen Dietary Supplement Consumption in Chiang Rai Province". Journal of Community Development and Life Quality 5 (2017):282-308.Narunan Wuttisin และ Daraphan Sangziw and Wipada Chaiya. Survey of Collagen Dietary Supplement Consumption in Chiang Rai Province. Somsak Publisher:ม.ป.ท. 2017.