Chaikaew, Pinanong, Piyanuch Nguernklai, Surachai Sirikrai, and Thanyathip Sripana. 2021. “Tourism Cooperative Strategies Between Chiang Rai Province, Thailand and Bokeo Province, Lao PDR for Sustainable Tourism”. Ph.D. in Social Sciences Journal 11 (3):734-45. https://so05.tci-thaijo.org/index.php/phdssj/article/view/178629.