《司马法·天子之义》
兵车：夏代叫钩车，注重行驶平稳；殷代叫寅车，注重行动迟速；周代叫元戎，注重结构精良。
戎车：夏后氏曰钩车，先正也；殷曰寅车，先疾也；周日元戎，先良也。
Chariot: In the Xia Dynasty, it was called Gou, focusing on the smooth driving; in the Yin Dynasty, it was called Yin, focusing on the slow and fast action; in the Zhou Dynasty, it was called Yuanrong, focusing on the fine structure.