《水经注·卷二十二》
《地理志》说：发源于阳城县阳乾山。颖水有三个源头，右边的一条发源于阳乾山的颖谷。
《地理志》曰：出阳城县阳乾山，今颍水有三源奇发，右水出阳乾山之颍谷。
The Geographic Records says: It originates from Yangqian Mountain in Yangcheng County. The Ying River has three sources. The one on the right originates from Yinggu in Yangqian Mountain.