《明史·列传·卷一百九十九》
至此，四川布政司招抚他，芍德便前来朝觐进献贡马，请求朝廷设置长官司。
至是，四川布政司招之，德遂来朝贡马，请置长官司。
After this, the Sichuan provincial government recruited him. He Du thus came to court to present tribute horses and request that the dynasty establish a Longguan Commandery.