B. Gia Khanh, “GOVERNANCE IN NORTHWESTERN VIETNAM UNDER THE NGUYỄN DYNASTY (1802–1884): SEEN THROUGH THE THỔ QUAN (NATIVE OFFICIALS) – LƯU QUAN (IMPERIALLY APPOINTED OFFICIALS) POLICY”, HNUE Journal of Science: Journal of Social Sciences, vol. 71, no. 1, pp. 58–69, Jan. 2026, doi: 10.18173/2354-1067.2026-0006.