《魏书·列传·卷十二》
玄伯议论说： 三皇五帝确立国号，有的是藉用所出生的土地，有的是使用封国的名称。
玄伯议曰： 三皇五帝之立号也，或因所生之土，或即封国之名。
Xuanbo argued that: "The Three Sovereigns and Five Emperors established the national title, some adopted the place where they were born, and some used the name of the feudatory."