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* {{cite journal|title=Concerning "Lake Balls," "Cladophora Balls" and "Coal Balls"|last=Kindle|first=E. M.|publisher=[[University of Notre Dame]]|journal=[[American Midland Naturalist]]|volume=15|issue=6|date=November 1934|jstor=2419894|ref=harv|pages=752–760|doi=10.2307/2419894 }}
* {{cite web|url=http://www.isgs.uiuc.edu/about-isgs/heritage/noe.shtml|title=ISGS – Our Heritage – A Memorial: Adolf C. Noé|publisher=University of Illinois Board of Trustees|date=16 May 2011|last=Leighton|first=Morris W.|last2=Peppers|first2=Russel A.|ref={{harvid|Leighton|Peppers|2011}}|archiveurl=http://www.webcitation.org/65MsaJfDU|archivedate=11 February 2012|deadurl=no }}
* {{cite journal|last=Lomax|first=James|year=1903|title=On the occurrence of the nodular concretions (coal balls) in the lower coal measures|journal=Report of the annual meeting|publisher=[[British Association for the Advancement of Science]]|volume=72|pages=811–812|url=
* {{cite journal|title=Coalification of organic matter in coal balls of the Pennsylvanian (upper Carboniferous) of the Illinois Basin, United States|journal=Organic Geochemistry|volume=5|issue=4|pages=227–239|year=1984|publisher=[[Pergamon Press]]|last1=Lyons|first1=Paul C.|last2=Thompson|first2=Carolyn L.|last3=Hatcher|first3=Patrick G.|last4=Brown|first4=Floyd W.|last5=Millay|first5=Michael A.|last6=Szeverenyi|first6=Nikolaus|last7=Maciel|first7=Gary E.|ref={{harvid|Lyons et al.|1984}}|doi=10.1016/0146-6380(84)90010-X }}
* {{cite journal|last=Mamay|first=Sergius H.|last2=Yochelson|first2=Ellis L.|year=1962|title=Occurrence and significance of marine animal remains in American coal balls|journal=Shorter Contributions to General Geology|publisher=[[United States Geological Survey]]|pages=193–224|id={{Google books|yCYlAQAAIAAJ|Geological Survey Professional Paper, Volume 354}}|ref=harv }}
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* {{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=http://www.webcitation.org/60pHMElgE |archivedate=10 August 2011 |deadurl=no|ref={{Harvid|Smithsonian Institution|2007}} }}
* {{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=http://www.webcitation.org/61DXItxK1 |archivedate=25 August 2011 |deadurl=no|ref={{harvid|University of Santa Barbara, California|2011}} }}
* {{cite news|title=Ore Deposits Under Study – Chicago University professor to engage in research work|url=
* {{cite web|title=Paleobotany|url=http://www.cmnh.org/site/researchandcollections/Paleobotany.aspx|publisher=[[Cleveland Museum of Natural History]]|accessdate=10 September 2011|archiveurl=https://webcache.googleusercontent.com/search?q=cache:-Wbskx_N26oJ:www.cmnh.org/site/researchandcollections/Paleobotany.aspx+&cd=34&hl=en&ct=clnk&gl=us|archivedate=10 September 2011|deadurl=no|ref={{Harvid|Cleveland Museum of Natural History}} }}
{{refend}}
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