1. Ames, Roger, and Hall, David (2003). Dao De Jing “Making Life Significant”: A Philosophical Translation, Ballantine Books.
2. Cai, Qinghua (2013). Yan yi zhi bian yu yuyan zhexue de jiben wenti 言意之辨與語言哲學的基本問題 [Differentiation between Language and Meaning and the Basic Problems of the Philosophy of Language], Renmin Chubanshe.
3. Chan, Alan K. L., and Lo, Yuet-Keung (2010). Philosophy and Religion in Early Medieval China, State University of New York Press.
4. Chan, Alan (2022, March 25). Available online: https://plato.stanford.edu/entries/laozi/.
5. D’Ambrosio, Paul J., and Xiao, Ouyang (2020). The Annotated Critical Laozi: With Contemporary Explication and Traditional Commentary, Brill.