Shu, D., Zhang, X. and Chen, L. 1996. Reinterpretation of Yunnanozoon as the earliest known hemichordate, Nature. 380:428–430 (4 April 1996). [1] (页面存档备份,存于互联网档案馆) – accessed 3 December 2005
Shu, D., Zhang, X. and Chen, L. 1996. Reinterpretation of Yunnanozoon as the earliest known hemichordate, Nature. 380:428–430 (4 April 1996). [1] (页面存档备份,存于互联网档案馆) – accessed 3 December 2005