Nguyen Van Sang, and Hoang Thi Chi. “THE PROCESS OF CONCRETIZING THE DECLARATION OF SLAVERY EMANCIPATION IN AMERICA (1863- 1877)”. UED Journal of Social Sciences, Humanities and Education 3, no. 4 (December 24, 2013): 36-40. Accessed April 23, 2021. https://jshe.ued.udn.vn/index.php/jshe/article/view/493.