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* {{cite book | last1 = Seward | first1 = A. C. | title = Plant Life Through the Ages: A Geological and Botanical Retrospect | publisher = Cambridge University Press | year = 2010 | isbn = 978-1-108-01600-1|ref=harv }}
* {{cite book|last=Seward|first=Albert Charles|title=Fossil plants: a text-book for students of botany and geology|url=https://archive.org/details/in.ernet.dli.2015.271130|year=1898|publisher=Cambridge University Press|pages=[https://archive.org/details/in.ernet.dli.2015.271130/page/n103 84]–87|ref=harv }} {{PD-notice}}
* {{cite journal|last=Stopes|first=Marie C.|authorlink=Marie Stopes|last2=Watson|first2=David M. S.|authorlink2=D. M. S. Watson|year=1909|title=On the Present Distribution and Origin of the Calcareous Concretions in Coal Seams, Known as 'Coal Balls'|journal=Philosophical Transactions of the Royal Society|volume=200|pages=167–218|jstor=91931|bibcode=1909RSPTB.200..167S|ref=harv|doi=10.1098/rstb.1909.0005|issue=262–273 |doi-access=free}}
* {{cite web |url=http://paleobiology.si.edu/paleoart/techniques/pages/reconstuct9.htm |title=NMNH Paleobiology: Illustration Techniques |work=paleobiology.si.edu |publisher=[[Smithsonian Institution]] |year=2007 |accessdate=9 August 2011 |archiveurl=https://web.archive.org/web/20110826114828/http://paleobiology.si.edu/paleoart/techniques/pages/reconstuct9.htm |archivedate=26 August 2011 |url-status=dead |ref={{Harvid|Smithsonian Institution|2007}} |df=dmy }}
* {{cite web |url=http://www.mrl.ucsb.edu/mrl/centralfacilities/xray/xray-basics/index.html#x2 |title=Materials Research Lab – Introduction to X-ray Diffraction |work=Materials Research Lab |publisher=[[University of Santa Barbara, California]] |year=2011 |accessdate=25 August 2011 |archiveurl=https://www.webcitation.org/61DXItxK1?url=http://www.mrl.ucsb.edu/mrl/centralfacilities/xray/xray-basics/index.html |archivedate=26 August 2011 |url-status=dead |ref={{harvid|University of Santa Barbara, California|2011}} |df=dmy }}
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* {{cite book|title=The American Cyclopaedia: A Popular Dictionary of General Knowledge|editor-last=Ripley|editor-first=George|editor2-last=Dana|editor2-first=Charles A.|publisher=Appleton|year=1873|last=Conant|first=Blandina|volume=4|id={{Google books|aZhRAAAAYAAJ|The American Cyclopaedia: A Popular Dictionary of General Knowledge, Volume 4}}|ref=harv }} {{PD-notice}}
* {{cite journal|last=DiMichele|first=William A.|last2=Phillips|first2=Tom L.|year=1988|title=Paleoecology of the Middle Pennsylvanian-Age Herrin Coal Swamp (Illinois) Near a Contemporaneous River System, the Walshville Paleochannel|journal=Review of Palaeobotany and Palynology |volume=56|issue=1–2|pages=151–176|hdl=10088/7152|doi=10.1016/0034-6667(88)90080-2|ref=harv }}
* {{cite journal|last=Holmes|first=J|last2=Scott|first2=Andrew C.|year=1981|title=A note on the occurrence of marine animal remains in a Lancashire coal ball (Westphalian A)|journal=Geological Magazine|pages=307–308|doi=10.1017/S0016756800035809|volume=118|issue=3|ref=harv |bibcode=1981GeoM..118..307H|doi-access=free}}
* {{cite journal|title=The Mode of Origin of Coal|last=Jeffrey|first=Edward C.|journal=The Journal of Geology|year=1915 |volume=23|pages=218–230|id={{Google books|kX3zAAAAMAAJ|The Journal of Geology, volume 23}}|ref=harv|doi=10.1086/622227|issue=3|bibcode=1915JG.....23..218J |doi-access=free}} {{PD-notice}}
* {{cite book|title=Taphonomy: a process approach|year=1999|last1=Martin|first1=Robert E.|publisher=[[Cambridge University Press]]|edition=Illustrated|isbn=978-0-521-59833-0|ref=harv }}
* {{cite web |url=http://www.ucmp.berkeley.edu/paleo/fossils/permin.html |title=Fossils – Window To The Past (Permineralisation) |accessdate=8 July 2011 |archiveurl=https://web.archive.org/web/20130531184810/http://www.ucmp.berkeley.edu/paleo/fossils/permin.html |archivedate=31 May 2013 |url-status=dead |ref=harv |df=dmy }}
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