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* <!-- Co -->{{cite book| ref=Reference-idCook1968|title=The Encyclopedia of the Chemical Elements|last=Cook|first=Gerhard A.|coauthors=Lauer, Carol M.|publisher=Reinhold Book Corporation|location=New York|year=1968|pages=499–512|editor=Clifford A. Hampel|chapter=Oxygen|id=LCCN 68-29938}}
* <!-- Em -->{{cite book| ref=Reference-idEmsley2001 |title=Nature's Building Blocks: An A-Z Guide to the Elements|last=Emsley|first=John|publisher=Oxford University Press|year=2001|location=Oxford, England, UK|isbn=0-19-850340-7|chapter=Oxygen|pages=297–304}}
* <!-- Ra -->{{cite book| ref=Reference-idRaven2005 |last=Raven|first=Peter H.|coauthors=Ray F. Evert, Susan E. Eichhorn|title=Biology of Plants, 7th Edition|publisher=W.H. Freeman and Company Publishers|year=2005|location = New York|pages=115–27|isbn = 0-7167-1007-2}}
== වැඩිදුර කියැවුම් ==
* {{cite book|last=Walker|first=J.|year=1980|title=Handbook of Environmental Chemistry. Volume 1. Part A: The natural environment and the biogeochemical cycles|chapter=The oxygen cycle|publisher=Springer-Verlag|location=Berlin; Heidelberg; New York|editor=Hutzinger O.|pages=258|isbn=0387096884}}
