Dechasirikun, P. ., and P. Pisitkasem. “The Improvement of Agricultural Product Procurement and Delivery Process of Coconut Siam Export Company Limited by LEAN”. Journal of Humanities and Social Sciences, Rajapruk University, vol. 7, no. 3, Dec. 2021, pp. 358-74, https://so03.tci-thaijo.org/index.php/rpu/article/view/257362.