Kidjaideaw, S., S. Kaewchada, W. Sookhkathon, and A. Sukthong. “OTOP PRODUCT MARKETING SYSTEM IN NA RONG SUBDISTRICT, NAKHON SI THAMMARAT PROVINCE”. Life Sciences and Environment Journal, vol. 21, no. 2, Sept. 2020, pp. 502-11, https://ph01.tci-thaijo.org/index.php/psru/article/view/242488.