《资治通鉴·唐纪·唐纪四十八》
李泌本意打算联合回纥、大食、云南，与他们共同图谋吐蕃，使吐蕃需要防备的敌手增多，但他知道德宗平素憎恨回纥，惟恐听到他的建议会不高兴，会连同屯田的计议也不实施了，所以他不肯讲出来。
泌意欲结回纥、大食、云南与共图吐蕃，令吐蕃所备者多。知上素恨回纥，恐闻之不悦，并屯田之议不行，故不肯言。
Li Bi originally planned to unite Huihe, Dashi and Yunnan to plot against Tubo together with them, so that Tubo would have more enemies to guard against. However, he knew that Dezong hated Huihe on weekdays and was afraid that he would be unhappy to hear his suggestion, and would not even implement the plan of屯田, so he refused to say it.