Tributary Trade Activity in Diplomatic Relations between Vietnam & China in the Feudal Period. Global Journal of Human-Social Science, [S. l.], v. 15, n. 46, p. 69–80, 2015. Disponível em: https://socialscienceresearch.org/index.php/GJHSS/article/view/104802. Acesso em: 20 oct. 2026.