司馬光：Zizhi Tongjian, Volume 192, Entry 21

上問公卿以享國久長之策，蕭瑀言：「三代封建而久長，秦孤立而速亡。」上以為然，於是始有封建之議。

Source： https://zh.wikisource.org/wiki/%E8%B3%87%E6%B2%BB%E9%80%9A%E9%91%91/%E5%8D%B7192
Locator：卷192·太宗文武大聖大廣孝皇帝上之上貞觀元年（丁亥，公元六二七年）·第21则 · Verified：2026-10-19 · Verification：Exact match

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