สิมมา ดร.พีรพล ดร.พีรพล. (2023) 2023. “The Senator Acquisition Problem : Comparative Notes to United States of America”. Journal of Humanities and Social Sciences Loei Rajabhat University 5 (1). Loei:16-29. https://so01.tci-thaijo.org/index.php/husolru/article/view/263542.