Reid, Mark J.; McClintock, Jeffrey E.; Narayan, Ramesh; Gou, Lijun; Remillard, Ronald A.; Orosz, Jerome A. (Aralık 2011), "The Trigonometric Parallax of Cygnus X-1", The Astrophysical Journal, 742 (2), s. 83, arXiv:1106.3688 $2, Bibcode:2011ApJ...742...83R, doi:10.1088/0004-637X/742/2/83
Ziółkowski, J. (2005), "Evolutionary constraints on the masses of the components of HDE 226868/Cyg X-1 binary system", Monthly Notices of the Royal Astronomical Society, 358 (3), ss. 851-859, arXiv:astro-ph/0501102 $2, Bibcode:2005MNRAS.358..851Z, doi:10.1111/j.1365-2966.2005.08796.x Note: for radius and luminosity, see Table 1 with d=2 kpc.
Hadrava, Petr (Eylül 15–21, 2007), "Optical spectroscopy of Cyg X-1", Proceedings of RAGtime 8/9: Workshops on black holes and neutron stars, Opava, Czech Republic, s. 71, arXiv:0710.0758 $2, Bibcode:2007ragt.meet...71H
5 Haziran 2016 tarihinde Wayback Machine sitesinde [https://web.archive.org/web/20160605131108/http://arxiv.org/abs/1401.1035 arşivlendi. [1401.1035] Masses of the components of the HDE 226868/Cyg X-1 binary system]
Reid, Mark J.; McClintock, Jeffrey E.; Narayan, Ramesh; Gou, Lijun; Remillard, Ronald A.; Orosz, Jerome A. (Aralık 2011), "The Trigonometric Parallax of Cygnus X-1", The Astrophysical Journal, 742 (2), s. 83, arXiv:1106.3688 $2, Bibcode:2011ApJ...742...83R, doi:10.1088/0004-637X/742/2/83
Ninkov, Z.; Walker, G. A. H.; Yang, S. (1987), "The primary orbit and the absorption lines of HDE 226868 (Cygnus X-1)", Astrophysical Journal, cilt 321, ss. 425-437, Bibcode:1987ApJ...321..425N, doi:10.1086/165641
Ziółkowski, J. (2005), "Evolutionary constraints on the masses of the components of HDE 226868/Cyg X-1 binary system", Monthly Notices of the Royal Astronomical Society, 358 (3), ss. 851-859, arXiv:astro-ph/0501102 $2, Bibcode:2005MNRAS.358..851Z, doi:10.1111/j.1365-2966.2005.08796.x Note: for radius and luminosity, see Table 1 with d=2 kpc.
Gies, D. R.; Bolton, C. T. (1986), "The optical spectrum of HDE 226868 = Cygnus X-1. II — Spectrophotometry and mass estimates", The Astrophysical Journal, Part 1, cilt 304, ss. 371-393, Bibcode:1986ApJ...304..371G, doi:10.1086/164171
Bregman, J.; Butler, D.; Kemper, E.; Koski, A.; Kraft, R. P.; Stone, R. P. S. (1973), "Colors, magnitudes, spectral types and distances for stars in the field of the X-ray source Cyg X-1", Lick Observatory Bulletin, cilt 647, s. 1, Bibcode:1973LicOB..24....1B
Reid, Mark J.; McClintock, Jeffrey E.; Narayan, Ramesh; Gou, Lijun; Remillard, Ronald A.; Orosz, Jerome A. (Aralık 2011), "The Trigonometric Parallax of Cygnus X-1", The Astrophysical Journal, 742 (2), s. 83, arXiv:1106.3688 $2, Bibcode:2011ApJ...742...83R, doi:10.1088/0004-637X/742/2/83
Ninkov, Z.; Walker, G. A. H.; Yang, S. (1987), "The primary orbit and the absorption lines of HDE 226868 (Cygnus X-1)", Astrophysical Journal, cilt 321, ss. 425-437, Bibcode:1987ApJ...321..425N, doi:10.1086/165641
Ziółkowski, J. (2005), "Evolutionary constraints on the masses of the components of HDE 226868/Cyg X-1 binary system", Monthly Notices of the Royal Astronomical Society, 358 (3), ss. 851-859, arXiv:astro-ph/0501102 $2, Bibcode:2005MNRAS.358..851Z, doi:10.1111/j.1365-2966.2005.08796.x Note: for radius and luminosity, see Table 1 with d=2 kpc.
Hadrava, Petr (Eylül 15–21, 2007), "Optical spectroscopy of Cyg X-1", Proceedings of RAGtime 8/9: Workshops on black holes and neutron stars, Opava, Czech Republic, s. 71, arXiv:0710.0758 $2, Bibcode:2007ragt.meet...71H
Gies, D. R.; Bolton, C. T. (1986), "The optical spectrum of HDE 226868 = Cygnus X-1. II — Spectrophotometry and mass estimates", The Astrophysical Journal, Part 1, cilt 304, ss. 371-393, Bibcode:1986ApJ...304..371G, doi:10.1086/164171
"2010 X-Ray Sources", The Astronomical Almanac, U.S. Naval Observatory, 28 Mart 2010 tarihinde kaynağından arşivlendi, erişim tarihi: 4 Ağustos 2009 gives a range of 235–1320 μJy at energies of 2–10 kEv, where a Jansky (Jy) is 10-26 Wm−2 Hz−1.
"2010 X-Ray Sources", The Astronomical Almanac, U.S. Naval Observatory, 28 Mart 2010 tarihinde kaynağından arşivlendi, erişim tarihi: 4 Ağustos 2009 gives a range of 235–1320 μJy at energies of 2–10 kEv, where a Jansky (Jy) is 10-26 Wm−2 Hz−1.
Harko, T. (28 Haziran 2006), Black Holes, University of Hong Kong, 10 Şubat 2009 tarihinde kaynağından arşivlendi, erişim tarihi: 28 Mart 2008