Do, Thi Ha Tho. 2022. “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 (4):73-79. https://doi.org/10.52714/dthu.11.4.2022.968.