Chutiphongdech T, Ploychankul C, Chumnanont C. An Analysis of Dark Green Ecotourist Demand Using Value Proposition Canvas. CBSJ [internet]. 2021 Mar. 18 [cited 2026 Sep. 2];43(1):22-37. available from: https://so01.tci-thaijo.org/index.php/CBSReview/article/view/246803