"डिवोनी कल्प": अवतरणों में अंतर

* [https://web.archive.org/web/20100211070749/http://www.devoniantimes.org/index.html The Devonian times] - an excellent and frequently updated resource focussing on the Devonian period

* [https://web.archive.org/web/20120929061004/http://www.ucmp.berkeley.edu/devonian/devlife.html UC Berkeley site introduces the Devonian.]

* {{cite web | title=International Commission on Stratigraphy (ICS)| work=Geologic Time Scale 2004| url=http://www.stratigraphy.org/ | accessdate=September 19, 2005| archive-url=https://web.archive.org/web/20050920105136/http://www.stratigraphy.org/| archive-date=20 सितंबर 2005| url-status=live}}

* [https://web.archive.org/web/20120912094209/http://www.geo-lieven.com/erdzeitalter/devon/devon.htm Examples of Devonian Fossils]