《资治通鉴·陈纪·陈纪九》
隋朝河南道行台后部尚书杨尚希上奏： 我发现当今郡县多于古代成倍。
河南道行台兵部尚书杨尚希曰： 窃见当今郡县，倍多于古。
Yang Shangxi, Deputy Secretary for the Ministry of Revenue of the Sui Dynasty's Henan Circuit, memorialized: I have discovered that the number of commanderies and counties today is several times greater than in ancient times.