Trung, Nguyen, AND 		Hung, Nguyen.
" MODELS FOR ENHANCING THE FOREIGN LANGUAGE PROFICIENCY OF OFFICIALS AND OFFICERS IN THE CUSTOMS, FOREIGN RELATIONS, TOURISM AND BORDER GUARDS SECTORS IN VIETNAM’S NORTHERN BORDER REGIONS: FROM PRACTICE TO KEY PRINCIPLES" <em>VNU Journal of Foreign Studies</em> [Online], Volume 34 Number 6 (3 December 2018)