Crawford, D. L.; Barnes, J. V.; Golson, J. C. (1971), «Four-color, H-beta, and UBV photometry for bright B-type stars in the northern hemisphere», The Astronomical Journal76: 1058, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220
Cassinelli, J. P.; et al. (February 1994), «X-ray emission from near-main-sequence B stars», Astrophysical Journal, Part 1421 (2): 705–717, Bibcode:1994ApJ...421..705C, doi:10.1086/173683
Crawford, D. L.; Barnes, J. V.; Golson, J. C. (1971), «Four-color, H-beta, and UBV photometry for bright B-type stars in the northern hemisphere», The Astronomical Journal76: 1058, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220
Cassinelli, J. P.; et al. (February 1994), «X-ray emission from near-main-sequence B stars», Astrophysical Journal, Part 1421 (2): 705–717, Bibcode:1994ApJ...421..705C, doi:10.1086/173683