《资治通鉴·唐纪·唐纪三十》
当时武惠妃在后宫的嫔妃中最受玄宗的宠爱，生子为寿王李清，也深得玄宗的喜欢，诸皇子难以为比，因此太子渐渐被疏远了。
时武惠妃宠幸倾后宫，生寿王清，诸子莫得为比，太子浸疏薄。
At that time, Consort Wu was the most favored concubine in the palace. She gave birth to Li Qing, Prince of Shou. Emperor Xuanzong loved this son as well. The other princes could not compare with him. Therefore, the crown prince was gradually alienated.