Le, Van At. “A STUDY OF THE CHARACTERISTICS OF VIETNAMESE MAPS IN THE 19th CENTURY WITH SPECIAL REFERENCE TO HOÀNG LÊ CẢNH HƯNG BẢN ĐỒ”. Thang Long Journal of Science: Van hien and Heritage 1, no. 2 (February 22, 2023): 60–69. Accessed November 11, 2024. https://science.thanglong.edu.vn/index.php/volb/article/view/30.