《资治通鉴·唐纪·唐纪三十四》
这时建宁王李说： 殿下过去曾经做过朔方节度大使，朔方镇的将领官吏每年送来问安书，我大略记得他们的姓名。
建宁王倓曰： 殿下昔尝为朔方节度大使，将吏岁时致启，倓略识其姓名。
At this time, King Jianning Li said: Your Highness was once the Marching Commander of the Shuofang Region. The generals and officials of the Shuo Fangzhen would send greeting letters every year. I can vaguely remember their names.