Chutiphongdech, Thanavutd, Chutima Ploychankul, and Chanoksuda Chumnanont. “An Analysis of Dark Green Ecotourist Demand Using Value Proposition Canvas”. Creative Business and Sustainability Journal 43, no. 1 (March 18, 2021): 22–37. Accessed May 19, 2024. https://so01.tci-thaijo.org/index.php/CBSReview/article/view/246803.