《魏书·列传·卷七》
况且元匡奏疏中说： 所依据的铜称锤，形状如同古代记载，表明是汉朝所制，不是新莽另造。 
况匡表云： 所据铜权，形如古志，明是汉作，非莽别造。 
Moreover, in the memorial Yuan Kuang submitted it is said: "The copper weights and scales I have studied, are in the shape recorded in the ancient texts, indicating that they were made during the Han Dynasty, and not newly made by Xin Mang.