《明史·志·卷七十》
推究京官和地方官贪污的起源，以六曹为罪魁，郭桓为死罪之首。
其推原中外贪墨所起，以六曹为罪魁，郭桓为诛首。
Tracing the origins of corruption among metropolitan and local officials, the Six Ministries were the main culprits, with Guo Huan as the chief criminal.