et. al., Luu Van Quyet,. “Rach Cat Fort - The Largest French-Built Strategic Fort In Vietnam In Early 20th Century”. Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 11 (May 10, 2021): 968–975. Accessed April 28, 2024. https://turcomat.org/index.php/turkbilmat/article/view/5987.