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): 851–859, arXiv:astro-ph/0501102, डीओआइ:10.1111/j.1365-2966.2005.08796.x, बिबकोड:2005MNRAS.358..851Z Note: for radius and luminosity, see Table 1 with d=2 kpc.
Hadrava, Petr (September 15–21, 2007), "Optical spectroscopy of Cyg X-1", Proceedings of RAGtime 8/9: Workshops on black holes and neutron stars, Opava, Czech Republic: 71, arXiv:0710.0758, बिबकोड:2007ragt.meet...71H
Gallo, Elena; Fender, Rob (2005), "Accretion modes and jet production in black hole X-ray binaries", Memorie della Società Astronomica Italiana, 76: 600–607, arXiv:astro-ph/0509172, बिबकोड:2005MmSAI..76..600G
Ninkov, Z.; Walker, G. A. H.; Yang, S. (1987), "The primary orbit and the absorption lines of HDE 226868 (Cygnus X-1)", Astrophysical Journal, 321: 425–437, डीओआइ:10.1086/165641, बिबकोड:1987ApJ...321..425N
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): 851–859, arXiv:astro-ph/0501102, डीओआइ:10.1111/j.1365-2966.2005.08796.x, बिबकोड:2005MNRAS.358..851Z Note: for radius and luminosity, see Table 1 with d=2 kpc.
Bregman, J.; एवं अन्य (1973), "Colors, magnitudes, spectral types and distances for stars in the field of the X-ray source Cyg X-1", Lick Observatory Bulletin, 647: 1, बिबकोड:1973LicOB..24....1B
Ninkov, Z.; Walker, G. A. H.; Yang, S. (1987), "The primary orbit and the absorption lines of HDE 226868 (Cygnus X-1)", Astrophysical Journal, 321: 425–437, डीओआइ:10.1086/165641, बिबकोड:1987ApJ...321..425N
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): 851–859, arXiv:astro-ph/0501102, डीओआइ:10.1111/j.1365-2966.2005.08796.x, बिबकोड:2005MNRAS.358..851Z Note: for radius and luminosity, see Table 1 with d=2 kpc.
Hadrava, Petr (September 15–21, 2007), "Optical spectroscopy of Cyg X-1", Proceedings of RAGtime 8/9: Workshops on black holes and neutron stars, Opava, Czech Republic: 71, arXiv:0710.0758, बिबकोड:2007ragt.meet...71H
Gallo, Elena; Fender, Rob (2005), "Accretion modes and jet production in black hole X-ray binaries", Memorie della Società Astronomica Italiana, 76: 600–607, arXiv:astro-ph/0509172, बिबकोड:2005MmSAI..76..600G