Thuy, Do Thi Bich. “VALIDITY ANALYSIS OF 2A + 2B GRAMMAR - VOCABULARY TESTS AT THE FACULTY OF FRENCH LANGUAGE AND CULTURE, UNIVERSITY OF LANGUAGES AND INTERNATIONAL STUDIES - VIETNAM NATIONAL UNIVERSITY, HANOI”. VNU Journal of Foreign Studies, vol. 34, no. 6, Dec. 2018, doi:10.25073/2525-2445/vnufs.4326.