^Cowen, R. (2000). History of Life (3rd ed.). Blackwell Science. p. 63. ISBN0-632-04444-6.
^Hou, X-G; Aldridge, R.J.; Bengstrom, J.; Siveter, D.J. & Feng, X-H (2004). The Cambrian Fossils of Chengjiang, China. Blackwell Science. p. 233.
Resources referenced
A further list available in Li, G.; Steiner, M.; Zhu, X.; Yang, A.; Wang, H.; Erdtmann, B. D. (2007). "Early Cambrian metazoan fossil record of South China: Generic diversity and radiation patterns". Palaeogeography, Palaeoclimatology, Palaeoecology. 254 (1–2): 229–249. doi:10.1016/j.palaeo.2007.03.017.
More in Steiner, M.; Li, G.; Qian, Y.; Zhu, M. (2004). "Lower Cambrian Small Shelly Fossils of northern Sichuan and southern Shaanxi (China), and their biostratigraphic importance". Geobios. 37 (2): 259. doi:10.1016/j.geobios.2003.08.001.