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Theodossiou, E.; Danezis, E. (September 1991), "The stellar temperature scale for stars of spectral types from O8 to F6 and the standard deviation of the MK spectral classification", Astrophysics and Space Science, 183 (1): 91–115, Bibcode:1991Ap&SS.183...91T, doi:10.1007/BF00643019, S2CID119703222.
"The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on 2013-12-03, retrieved 2012-01-16