《资治通鉴·唐纪·唐纪二十七》
奚、契丹二族归附朝廷之后，贝州刺史宋庆礼建议玄宗重设营州。
奚、契丹既内附，贝州刺史宋庆礼建议，请复营州。
After the Xi and Khitan became vassals, Song Qingli, the governor of Bei Prefecture, suggested that Emperor Xuanzong should re-establish Ying Prefecture.