《明史·志·卷二十六》
黄帝出车歌诀说： 饰以象牙的主帅旗帜，是将军的精神，是全军面貌的体现。
黄帝出军诀曰： 牙旗者，将军之精，一军之形侯。
The Huangdi's Chuge Song Jue says: "The commander-in-chief's banner decorated with ivory is the spirit of the general and the embodiment of the whole army's appearance.