Revisi per 17 Maret 2008 06.40 sunting Borgxbot (bicara \| kontrib) 259.487 suntingan k Robot: Cosmetic changes ← Revisi sebelumnya		Revisi per 4 Desember 2008 09.43 sunting balikkan Bennylin (bicara \| kontrib) Pengurus antarmuka, Pengurus 255.180 suntingan k accessdaymonth Revisi selanjutnya →
Baris 6: * [http://www.ucmp.berkeley.edu/permian/permstrat.html University of California offers a more modern Permian stratigraphy] * [http://www.ucmp.berkeley.edu/permian/glassmts.html Classic Permian strata in the Glass Mountains of the Permian Basin] * {{cite web \| title=International Commission on Stratigraphy (ICS)\| work=Geologic Time Scale 2004\| url=http://www.stratigraphy.org/ \| ~~accessmonthday~~accessdaymonth=19 September \| accessyear=2005}} * [http://www.geo-lieven.com/erdzeitalter/perm/perm.htm Examples of Permian Fossils]

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