《后汉书·列传·循吏列传》
在这以前杜陵人杜笃向皇帝进献《论都赋》，想使都城迁往长安。
先是杜陵杜笃奏上《论都赋》，欲令车驾迁还长安。
Before this, Du Du of Duling had submitted to the emperor his "Treatise on the Capital," with the aim of having the capital moved to Chang'an.