Tarigan, Karisma Erikson, and Margaret Stevani. “The Adaptation of Multilingualism in the Authentication of Tourism: From Demographic Vitality to Human Resources”. British Journal of Philosophy, Sociology and History, vol. 1, no. 1, Nov. 2021, pp. 29-36, https://al-kindipublishers.org/index.php/bjpsh/article/view/2451.