Suphan, K. (2021). An Analysis of Internal and External Environment in Tourism of Isan Agriculture Fair to Create an Image for Becoming to be Greater Mekong Subregion Agriculture Fair. Research and Development Journal, Loei Rajabhat University, 16(56), 54–63. retrieved from https://so05.tci-thaijo.org/index.php/researchjournal-lru/article/view/245542