Wang Guilian,Jining. “THE IMPORTANT POSITION AND EFFECTS OF PIANGUAN IN THE DEFENSE SYSTEM OF THE MING GREAT WALL”. Ethiopian International Journal of Multidisciplinary Research 11, no. 02 (February 11, 2024): 53–57. Accessed December 14, 2025. https://www.eijmr.org/index.php/eijmr/article/view/1042.