《资治通鉴·齐纪·齐纪四》
等到被封为皇太孙以后，武帝有病，他又命令杨氏向上天祈祷。此时，他的正室何婧英还留在西州，武帝的病开始严重时，太孙给何婧英写信，就在信纸中间写了一个大喜字，又围绕着大喜字，在旁边写了三十六个小喜字。
时何妃犹在西州，世祖疾稍危，太孙与何妃书，纸中央作一大喜字，而作三十六小喜字绕之。
After being enfeoffed as the heir apparent, when Wu Di fell ill, he again ordered the Yang sisters to make prayers on his behalf. At that time, his main consort He Jingying was still in Xizhou. When Wu Di's illness became grave, the Grandson sent a letter to He Jingying with a large character of "joy" written in the center of the paper. Around this "joy" character, he wrote 36 "joy" characters of smaller size.