"Cambria-kí" pán-pún chi-kan bô-kāng--ê tē-hng

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* [https://web.archive.org/web/20030829130602/http://www.earth-pages.com/archive/geobiology.asp Report on the web on Amthor and others from ''Geology'' vol. 31]
* [https://web.archive.org/web/20090616125244/http://www.astrobio.net/news/article251.html Weird Life on the Mats]
* [https://ghkclass.com/ghkC.html?Cambrian Chronostratigraphy scale v.2018/08 | Cambrian]{{Dead link|date=July 2020 |bot=InternetArchiveBot |fix-attempted=yes }}
 
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