Yang Kuan's "Warring States Policy" is a rare classic, and children have a lot of classical Chinese, which is difficult to understand. Yang Kuan's can be used as an introductory book.

2. Spring and Autumn Annals

Zuo zhuan

Mandarin

Conspiracy in the warring States period

Yanzi Chunqiu

Lu Chunqiu

3. The Four Books and the Five Classics all talk about this, namely the Five Classics, the Book of Songs, Shangshu, Yili, Jing Yue, Zhouyi and Chunqiu.

Five Classics, Book of Songs, Shangshu, Yili, Jing Yue, Zhouyi, Chunqiu.

I hope it helps you.