Maloof, A. C.; Porter, S. M.; Moore, J. L.; Dudas, F. O.; Bowring, S. A.; Higgins, J. A.; Fike, D. A.; Eddy, M. P. (2010). "The earliest Cambrian record of animals and ocean geochemical change". Geological Society of America Bulletin. 122 (11–12): 1731-1774. Bibcode:2010GSAB..122.1731M. doi:10.1130/B30346.1.
Erwin, D. H.; Laflamme, M.; Tweedt, S. M.; Sperling, E. A.; Pisani, D.; Peterson, K. J. (2011). "The Cambrian conundrum: early divergence and later ecological success in the early history of animals". Science. 334 (6059): 1091-1097. Bibcode:2011Sci...334.1091E. doi:10.1126/science.1206375. PMID22116879.
Maloof, A. C.; Porter, S. M.; Moore, J. L.; Dudas, F. O.; Bowring, S. A.; Higgins, J. A.; Fike, D. A.; Eddy, M. P. (2010). "The earliest Cambrian record of animals and ocean geochemical change". Geological Society of America Bulletin. 122 (11–12): 1731-1774. Bibcode:2010GSAB..122.1731M. doi:10.1130/B30346.1.
Erwin, D. H.; Laflamme, M.; Tweedt, S. M.; Sperling, E. A.; Pisani, D.; Peterson, K. J. (2011). "The Cambrian conundrum: early divergence and later ecological success in the early history of animals". Science. 334 (6059): 1091-1097. Bibcode:2011Sci...334.1091E. doi:10.1126/science.1206375. PMID22116879.
Erwin, D. H.; Laflamme, M.; Tweedt, S. M.; Sperling, E. A.; Pisani, D.; Peterson, K. J. (2011). "The Cambrian conundrum: early divergence and later ecological success in the early history of animals". Science. 334 (6059): 1091-1097. Bibcode:2011Sci...334.1091E. doi:10.1126/science.1206375. PMID22116879.
"Stratigraphic Chart 2022"(PDF). International Stratigraphic Commission. February 2022. Erişim tarihi: 22 Nisan 2022.Arşivlenmesi gereken bağlantıya sahip kaynak şablonu içeren maddeler (link)