Chen (2009). «The sudden appearance of diverse animal body plansduring the Cambrian explosion.». The International journal of developmental biology53 (5-6): 733-751. PMID19557680. doi:10.1387/ijdb.072513cj.
Shu, D., Zhang, X. and Chen, L. 1996. Reinterpretation of Yunnanozoon as the earliest known hemichordate. Nature, 380: 428-430 Resumen - Acceso el 5 de octubre de 2009
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Chen (2009). «The sudden appearance of diverse animal body plansduring the Cambrian explosion.». The International journal of developmental biology53 (5-6): 733-751. PMID19557680. doi:10.1387/ijdb.072513cj.
