Morgan, W. W.; Roman, Nancy G. (November 1950), "Revised Standards for Supergiants on the System of the Yerkes Spectral Atlas", Astrophysical Journal, 112: 362–364, Bibcode:1950ApJ...112..362M, doi:10.1086/145351
Keenan, P. C.; Pitts, R. E. (April 1980), "Revised MK spectral types for G, K, and M stars", Astrophysical Journal Supplement Series, 42: 541–563, Bibcode:1980ApJS...42..541K, doi:10.1086/190662
Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M. {{cite journal}}: Unknown parameter |agency= ignored (help)
Morgan, W. W.; Roman, Nancy G. (November 1950), "Revised Standards for Supergiants on the System of the Yerkes Spectral Atlas", Astrophysical Journal, 112: 362–364, Bibcode:1950ApJ...112..362M, doi:10.1086/145351
Keenan, P. C.; Pitts, R. E. (April 1980), "Revised MK spectral types for G, K, and M stars", Astrophysical Journal Supplement Series, 42: 541–563, Bibcode:1980ApJS...42..541K, doi:10.1086/190662