Gray, R. O.; Garrison, R. F. The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation. The Astrophysical Journal Supplement Series. 1987, 65: 581. Bibcode:1987ApJS...65..581G. doi:10.1086/191237.
Gray, R. O.; Garrison, R. F. The Late A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation. The Astrophysical Journal Supplement Series. 1989, 70: 623. Bibcode:1989ApJS...70..623G. doi:10.1086/191349.
Habets, G. M. H. J.; Heintze, J. R. W. Empirical bolometric corrections for the main-sequence. Astronomy and Astrophysics Supplement Series. 1981, 46: 193. Bibcode:1981A&AS...46..193H.Tables VII, VIII
Morgan, W. W.; Abt, Helmut A.; Tapscott, J. W. Revised MK Spectral Atlas for stars earlier than the sun. 1978. Bibcode:1978rmsa.book.....M.
Gray, R. O.; Garrison, R. F. The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation. The Astrophysical Journal Supplement Series. 1987, 65: 581. Bibcode:1987ApJS...65..581G. doi:10.1086/191237.
Gray, R. O.; Garrison, R. F. The Late A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation. The Astrophysical Journal Supplement Series. 1989, 70: 623. Bibcode:1989ApJS...70..623G. doi:10.1086/191349.