2. Mencius, in the middle of the Warring States Period, Mencius and his disciples Zhang Wan and Gong Sunchou. This book records the politics, education, philosophy, ethical thoughts and political activities of Mencius and his disciples.
3. Tao Te Ching is a philosophical work of Lao Zi (Li Er) in the Spring and Autumn Period, also known as Tao Te Ching, Lao Zi's Five Thousand Words and Lao Zi's Five Thousand Articles, which was written before the separation of pre-Qin philosophers in ancient China.
4. Zhuangzi, also known as Nanhuajing, is a Taoist classic written by Zhuangzi and later scholars in the middle of the Warring States Period, and is also called "San Xuan" with Laozi and Zhouyi.