Nguyen, Dung. “FORMATION AND DEVELOPMENT OF THE SLAVERY IN THE UNITED STATES ( FROM BEGINNING TO THE WAR FOR INDEPENDENCE )”. Science and Technology Development Journal 14, no. 1 (March 30, 2011): 46-61. Accessed July 3, 2024. https://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/1895.