司馬光：Zizhi Tongjian, Volume 197, Entry 24

前宜州刺史鄭元□，已致仕，上以其嘗從隋煬帝伐高麗，召詣行在；問之，對曰：「遼東道遠，糧運艱阻；東夷善守城，攻之不可猝下。」上曰：「今日非隋之比，公但聽之。」

Source： https://zh.wikisource.org/wiki/%E8%B3%87%E6%B2%BB%E9%80%9A%E9%91%91/%E5%8D%B7197
Locator：卷197·太宗文武大聖大廣孝皇帝中之下貞觀十八年（甲辰，公元六四四年）·第24则 · Verified：2026-10-19 · Verification：Exact match

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