Do, . T. T. L. “BARBARIANS AND THE KINH - TRẠI SEPARATION: PERCEPTIONS OF THE ĐẠI VIỆT DYNASTIES ON THE UPLANDS (11TH-16TH CENTURIES)”. Thang Long Journal of Science: Van Hien and Heritage, vol. 1, no. 2, Feb. 2023, pp. 116-42, https://science.thanglong.edu.vn/index.php/volb/article/view/35.