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Dòng 57:
* Monks, Neale and Palmer, Phil. ''Ammonites''. Natural History Museum, 2002.
* [[Cyril Walker (paleontologist)|Walker, Cyril]] và [[David Ward (paleontologist)|Ward, David]]. ''Fossils''. Dorling, Kindersley Limited, London, 2002.
* [http://is.dal.ca/~ceph/TCP/evolution.html A Broad Brush History of the Cephalopoda] {{Webarchive|url=https://web.archive.org/web/20050307100033/http://is.dal.ca/~ceph/TCP/evolution.html |date=2005-03-07 }} by Dr. Neale Monks, from The Cephalopod Page.
* [http://is.dal.ca/%7Eceph/TCP/ammonage.html Ammonite maturity, pathology and old age] By Dr. Neale Monks, from The Cephalopod Page. Essay about the life span of Ammonites.
* [http://www.cretaceousfossils.com/invertebrates/ammonites/ammonites_index.htm Cretaceous Fossils Taxonomic Index for Order Ammonoitida] {{Webarchive|url=https://web.archive.org/web/20051201091554/http://www.cretaceousfossils.com/invertebrates/ammonites/ammonites_index.htm |date=2005-12-01 }}
* [http://www.nsf.gov/discoveries/disc_summ.jsp?cntn_id=100280&org=NSF Deeply Buried Sediments Tell Story of Sudden Mass Extinction]
Dòng 68:
* [http://www.goniat.org/ goniat.org, a palaezoic ammonoid database]
* [http://www.paleozoic.org/gallery.htm paleozoic.org: gallery of ammonite photographs]
* [http://y2u.co.uk/&002_Images/Lyme%20Regis%20Fossils%20%2001.htm photos of ammonites at Lyme Regis, UK] {{Webarchive|url=https://web.archive.org/web/20170306235239/http://y2u.co.uk/%26002_Images/Lyme%20Regis%20Fossils%20%2001.htm |date=2017-03-06 }}
* [http://taxonconcept.stratigraphy.net/source_main.php?doctaxid=618&doctaxname=Ammonoidea TaxonConcept's data on cretaceous ammonites]
* [http://thinkingwithpictures.blogspot.com/2008/06/ammonites-of-peacehaven.html The ammonites of Peacehaven - photos of giant cretaceous ammonites in Southern England]
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