《三国志·魏书·任苏杜郑仓传》
因为他父亲杜畿为国勤勉最后死在水中，最后被罢免官职，成为平民，他就搬迁到章武郡，这一年是嘉平元年。
以父畿勤事水死，免为庶人，徙章武郡，是岁嘉平元年。
Because his father, Du Ji, had performed so diligently in service to his country and eventually died honorably in the flooding, Du Shu was allowed to be stripped of his post and sent back home to be a commoner. That year was the first year of Jiaping.