Do, Thi Ha Tho. “Introduction to the Documents of Projection, Threading and Ordinating for Xuan Quang Hau Nguyen Khac Tuan (1767 - 1823)”. Dong Thap University Journal of Science 11, no. 4 (August 11, 2022): 73–79. Accessed May 20, 2024. https://dthujs.vn/index.php/dthujs/article/view/212.