↑CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data. Haynes, William M.,, Lide, David R., 1928-, Bruno, Thomas J. (2016-2017, 97th ed.). Boca Raton, Florida. 2016-06-22. ISBN978-1-4987-5429-3. OCLC957751024.{{cite book}}: CS1 maint: others (ลิงก์)
↑ 13.013.1Generalic, Eni,"Radon," EniG. Periodic Table of the Elements. 27 May 2013. KTF-Split. (accessed 30 May 2013).
↑Peter Häussinger; Reinhard Glatthaar; Wilhelm Rhode; Helmut Kick; Christian Benkmann; Josef Weber; Hans-Jörg Wunschel; Viktor Stenke; Edith Leicht; Hermann Stenger (2002). "Noble gases". Ullmann's Encyclopedia of Industrial Chemistry. Wiley. doi:10.1002/14356007.a17_485. ISBN978-3527306732.
↑ 15.015.115.2Lide, D. R. (Ed.) (1990). CRC Handbook of Chemistry and Physics (70th Edn.). Boca Raton (FL):CRC Press.
↑ 19.019.1Lambda point for pure 4He from Yunus A. Cengel, Robert H. Turner. Fundamentals of thermal-fluid sciences. McGraw-Hill, 2004, p. 78. ISBN0-07-297675-6