«The Colour of Stars», Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), desember 21, 2004, arkivert frå originalen 3. desember 2013, henta 16. januar 2012
Crawford, D. L.; Barnes, J. V.; Golson, J. C. (desember 1971), «Four-color, Hbeta, and UBV photometry for bright B-type stars in the northern hemisphere», Astronomical Journal76: 1058–1071, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220
Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), «CHARM2: An updated Catalog of High Angular Resolution Measurements», Astronomy and Astrophysics431: 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039
Crawford, D. L.; Barnes, J. V.; Golson, J. C. (desember 1971), «Four-color, Hbeta, and UBV photometry for bright B-type stars in the northern hemisphere», Astronomical Journal76: 1058–1071, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220
Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), «CHARM2: An updated Catalog of High Angular Resolution Measurements», Astronomy and Astrophysics431: 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039
«The Colour of Stars», Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), desember 21, 2004, arkivert frå originalen 3. desember 2013, henta 16. januar 2012