Viet Ngoan, Nguyen. “STUDY ON THE LEARNING OF NGUYEN CONG TRU’S WORKS”. Science and Technology Development Journal 6, no. 5&6 (June 30, 2003): 77-86. Accessed May 19, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/3335.