1. ^{{cite book|last1=Needham|first1=Joseph|last2=Ronan|first2=Colin A.|title=The Shorter Science and Civilisation in China: 4|url=https://books.google.com/books?id=PehoSnJfstUC&pg=PA285|year=1978|publisher=Cambridge University Press|isbn=978-0-521-32995-8|pages=285–}}
2. ^世哲从弟黄头，使与诸囚自金凰台各乘纸鸱以飞，黄头独能至紫陌乃坠，仍付御史狱，毕义云饿杀之。(Rendering: Yuan Shize and his younger brother Yuan Huangtou with a few prisoners each launch themselves from Tower of the Golden Phoenix [in Ye, capital of the Northern Qi]. Yuan Huangtou was the only one who survived from this flight, as he glided over the city-wall and fell at Zimo [western segment of Ye] safely, but he was handed to Bi Yiyun and sentenced to death by starvation.). History of Northern Dynasties under 19.
3. ^（永定三年）使元黄头与诸囚自金凤台各乘纸鸱以飞，黄头独能至紫陌乃堕，仍付御史中丞毕义云饿杀之。(Rendering: [In the 3rd year of Yongding, 559], Gao Yang conducted an experiment by having Yuan Huangtou and a few prisoners each launch themselves from Tower of the Golden Phoenix [in Ye, capital of the Northern Qi]. Yuan Huangtou was the only one who survived from this flight, as he glided over the city-wall and fell at Zimo [western segment of Ye] safely, but he was handed to Bi Yiyun and sentenced to death by starvation.). Zizhi Tongjian under 167.