Sakvanichkul, Prasith l, and Kaedsiri Jaroenwisan. 2020. “A Study of the Efficiency of Logistic Services in Machine Tools and Metalworking Technology Exhibition”. Dusit Thani College Journal 14 (2):290-306. https://so01.tci-thaijo.org/index.php/journaldtc/article/view/243437.