《三国志·蜀书·后主传》
建兴九年春二月，诸葛亮再次出兵围攻祁山，开始创用木牛运送粮草。
九年春二月，亮复出军围祁山，始以木牛运。
In the second month of spring in the ninth year of Jianxing, Zhuge Liang again attacked Qishan, and began to use wooden oxen to transport military rations.