1. Ba, K. X. (1996). A new version of the view of the Chinese characters’ drag on the four modernizations [“Hanzi tuo sige xiandaihua houtui” lun defanban]. The Culture of Chinese Characters [Hanzi Wenhua], 2, 37–39.
2. Bai, J. S. (2011). Reflections on the decrease of the quality of Pinyin teaching [Dui hanyu pinyin jiaoxue zhiliang huipo de sikao]. Language Teaching Bulletin [Yuwen jiaoxue tongxun], 12, 10–13.
3. Cao, Z. Y. (2008). Linguistic atlas of Chinese dialects: Preface. Language Teaching and Linguistic Studies [Yuyan jiaoxue yu yanjiu], 2, 1–7.
4. Cao, Z. Y. (2009). On language preservation. Language Teaching and Linguistic Studies [Yuyan jiaoxue yu yanjiu], 1, 1–8.
5. Cao, Z. Y. (2015). On orientations, objectives, and missions of the project for protecting language resources of China. Applied Linguistics [Yuyan wenzi yingyong], 4, 10–17.