Ugo Junior Salamone อูโก้ จูเนียร์ ซาลาโมเน่. 2018. “Factors Affecting Decision Making of Thai Tourists in Purchasing Travel Package to Italy”. Dusit Thani College Journal 11 (1):240-57. https://so01.tci-thaijo.org/index.php/journaldtc/article/view/135539.