Geyer, Gerd; Landing, Ed (2017). "The Precambrian–Phanerozoic and Ediacaran–Cambrian boundaries: a historical approach to a dilemma". Geological Society, London, Special Publications. 448 (1): 311–349. Bibcode:2017GSLSP.448..311G. doi:10.1144/SP448.10.
Geyer, Gerd; Landing, Ed (2017). "The Precambrian–Phanerozoic and Ediacaran–Cambrian boundaries: a historical approach to a dilemma". Geological Society, London, Special Publications. 448 (1): 311–349. Bibcode:2017GSLSP.448..311G. doi:10.1144/SP448.10.
"Stratigraphic Chart 2022"(PDF). International Stratigraphic Commission. February 2022. Dicapai pada 20 April 2022. Ralat petik: Tag <ref> tidak sah, nama "StratChart 2022" digunakan secara berulang dengan kandungan yang berbeza