《新五代史·世家·越世家第七》
牙将倪德儒对董昌说： 过去民间谚语说罗平乌主宰越人的祸福，民间常画罗平鸟祈祷祭祀，我看你的签名和乌图相像。 
牙将倪德儒谓昌曰： 曩时谣言有罗平鸟主越人祸福，民间多图其形祷祠之，视王书名与图类。 
The tooth general Ni Deru said to Dong Chang: "In the past, the folk proverb said that Luoping bird is the master of Yue people's misfortune and happiness. People often draw Luoping bird to pray and sacrifice. I think your signature is similar to Wu Tu."