Conway Morris, S.; Collins, D. H. (29. marts 1996). "Middle Cambrian Ctenophores from the Stephen Formation, British Columbia, Canada". Philosophical Transactions of the Royal Society B: Biological Sciences. 351 (1337): 279-308. Bibcode:1996RSPTB.351..279C. doi:10.1098/rstb.1996.0024.
Conway Morris, S.; Collins, D. H. (29. marts 1996). "Middle Cambrian Ctenophores from the Stephen Formation, British Columbia, Canada". Philosophical Transactions of the Royal Society B: Biological Sciences. 351 (1337): 279-308. Bibcode:1996RSPTB.351..279C. doi:10.1098/rstb.1996.0024.