Xu Yuqing (2005) 陈郡袁氏的历史地位和作用 ("The position and historical position of the Yuan clan of Chen commandery"). Retrieved 15 November 2005.
hnsc.com.cn
Liang Wensheng, 香港广东袁氏知名人士到汝南寻根 ("Prominent Yuan of Hong Kong and Guangdong in search of roots in Ru'nan"), Zhumadian Daily, 29 October 2004. Retrieved 16 November 2005.
kosis.kr
KOSIS (2000 South Korean census results by surname and clan). Retrieved 27 March 2006.
southcn.com
Yang Ge, 袁崇焕故里弘扬英雄精神 ("Propagating a heroic spirit in the hometown of Yuan Chonghuan"), Southern Daily, 13 September 2004. Retrieved 16 November 2005.
tangjiacun.com
Tang Xueyou (1994) 袁姓改汤氏 ("Yuans change their surname to Tang"). Retrieved 15 November 2005. Also mentions "袁涛涂，其子袁选，其孙袁颇、袁侨均为陈国上卿", directly translate to "Yuan Taotu's son Yuan Xuan, grand sons Yuan Po and Yuan Qiao were all high officials in the State of Chen".
Chinese surnames pronounced "yuán" which still exist include: 袁, 元, 圆, 源, 原, and 垣; surnames that can be transliterated as "yuan" regardless of the tone include: 渊, 遠, 苑, 院, and 冤. Of these, only the first (the subject of this article) is ranked in the top 100 of Chinese surnames in terms of population. In modern times, the others have declined to less than 0.10% of the total Chinese population. For a discussion of surname extinction, see Galton–Watson process.
xys.org
Suri Badalaha (1998) 蒙古族族源新考 ("New study of the origins of the Mongols"). Retrieved 16 November 2005.
zmdw.org.cn
天下袁氏归汝南 ("Yuan of the world return to Ru'nan"), 2003. Retrieved 16 November 2005.
