《水经注·卷二十二》
颖水又东流，岸边有公路城，是袁术所筑，所以世人用袁术的字。公路来命名。
颍水又东，侧颍有公路城。袁术所筑也，故世因以术字名城矣。
Yingshui continues to flow east. On the bank is Gonglu city, which was built by Yuan Shu. Therefore, the world uses Yuan Shu's word "gonglu" to name it.