Sejarah Bumi: Perbedaan antara revisi

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<ref name="landing">{{cite journal | last = Landing | first = E. | coauthors = S. A. Bowring, K. L. Davidek, [[Richard Fortey|R. A. Fortey]], & W. A. P. Wimbledon | year = 2000 | title = Cambrian–Ordovician boundary age and duration of the lowest Ordovician Tremadoc Series based on U–Pb zircon dates from Avalonian Wales | journal = Geological Magazine | volume = 137 | issue = 5 | pages = 485–494 | doi = 10.1017/S0016756800004507 | url = http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=60617}} (abstract)</ref><ref name="liebermean">{{cite journal | last = Lieberman | first = Bruce S. | year = 2003 | title = Taking the Pulse of the Cambrian Radiation | journal = Integrative and Comparative Biology | volume = 43 | issue = 1 | pages = 229–237 | doi = 10.1093/icb/43.1.229 | url = http://icb.oxfordjournals.org/content/43/1/229.full | pmid=21680426 | ref = harv}}</ref>

<ref name="heckman">{{cite journal | last = Heckman | first = D. S. | coauthors = D. M. Geiser, B. R. Eidell, R. L. Stauffer, N. L. Kardos, & S. B. Hedges | date= August 10, 2001 | title = Molecular evidence for the early colonization of land by fungi and plants | journal = [[Science (journal)|Science]] | volume = 293 | issue = 5532 | pages = 1129–1133 | pmid = 11498589 | doi = 10.1126/science.1061457 | ref = harv}} (abstract)</ref>

<ref name="johnson">{{cite journal | last = Johnson | first = E. W. | coauthors = D. E. G. Briggs, R. J. Suthren, J. L. Wright, & S. P. Tunnicliff | date=1 May 1994 | title = Non-marine arthropod traces from the subaereal Ordivician Borrowdale volcanic group, English Lake District | journal = Geological Magazine | volume = 131 | issue = 3 | pages = 395–406 | url = http://geolmag.geoscienceworld.org/content/131/3/395.short | doi = 10.1017/S0016756800011146 | accessdate=2012-04-13 | ref = harv }} (abstract)</ref>

<ref name="waikato">{{cite web | url = http://sci.waikato.ac.nz/evolution/plantEvolution.shtml | title = Plant Evolution | work= Evolution for teaching | publisher = [[University of Waikato]] |date = October 2004 | accessdate = April 18, 2012}}</ref>

<ref name="willis">{{Cite book | last = Willis | first = K. J. | coauthors = J. C. McElwain | title = The Evolution of Plants | year = 2002 | publisher = Oxford University Press | location = Oxford | isbn = 0-19-850065-3 | page = 93}}</ref>

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