《资治通鉴·唐纪·唐纪十一》
太宗又派礼部尚书赵郡王李孝恭等人携带册封文书，就其部落聚居地，在黄河边筑立祭坛而册立他。
又遣礼部尚书赵郡王孝恭等赍册书，就其种落，筑坛于河上而立之。
Taizong also sent minister of rites Li Xiaogong to take the imperial edict to the place where their tribes lived, and built an altar beside the Yellow River to crown him.