1. A study on the internationalization of Chinese planning theory since the reform and opening-up;Cao K.;Planners,2019
2. Planning theory and the progress of Chinese planning theory since 1978;Cao K.;City Planning Review,2019
3. Chang W. (2014). Research on military fortresses of the four towns in the Northwest along the Ming’s Great Wall (Doctoral dissertation Tianjin University). China National Knowledge Infrastructure. https://kns.cnki.net/KCMS/detail/detail.aspx?dbname=CDFDLAST2017&filename=1017130420.nh
4. Chen W. (2016 May 22). Zhuanjia: ying jiji chuancheng Zhongguo youxiu chengshi guihua chuantong [Expert: China’s excellent urban planning tradition should be actively inherited]. Xinhua News Agency . http://www.xinhuanet.com//politics/2016-05/22/c_1118910725.htm
5. Fan X. (2015). Research on the mechanism of the layout of Ming Great Wall Military Defense System (Doctoral dissertation Tianjin University). China National Knowledge Infrastructure. https://kns.cnki.net/KCMS/detail/detail.aspx?dbname=CDFDLAST2016&filename=1016110570.nh