Kawon, K., S. Sarawong, and A. Wilaikaew. “Value of Willingness to Accept the Difference in Purchase Price of Green Sugarcane and Burned Sugarcane of Farmers in Pak Puan Sub-District, Wang Saphung District, Loei Province”. Research and Development Journal, Loei Rajabhat University, vol. 17, no. 61, Oct. 2022, pp. 17-25, https://so05.tci-thaijo.org/index.php/researchjournal-lru/article/view/258256.