Srivicha , N. and Pinangarm, P. (2021) “Feasibility Study for Business Investment of Pig Farm in Nonghan District, UdonThani Province”, Journal of Modern Learning Development, 6(6), pp. 118–131. available at: https://so06.tci-thaijo.org/index.php/jomld/article/view/250457 (accessed: 28 September 2026).