《南齐书·志·卷九》
《礼记。朝事议》说 天子头戴礼帽，手持的镇圭，有一尺二寸，率领诸侯到柬郊朝拜，为的是教导国民尊奉天尊 。
《礼记·朝事议》云 天子冕而执镇圭，尺有二寸，率诸侯朝日于东郊，所以教尊尊也 。
The Book of Rites: Chao Shiyi says that the emperor wears a ritual hat and holds a town 圭, which is one foot and two inches long, and leads the princes to worship in the outskirts of Jian, in order to teach the people to respect heaven.