S. Khunthong, K. Thongkaew, K. Dacha, Y. Fongsoovan, L. Sukkhird, and K. Pattamarakha, “Status of Dairy Milk Business in Phatthalung Province and Development Approaches to Its Sustainability”, kasetsart J. Soc. Sci., vol. 35, no. 1, pp. 147–157, Apr. 2014.