Cowan, J. J.; Sneden, C.; Burles, S.; Ivans, I. I.; Beers, T. C.; Truran, J. W.; Lawler, J. E.; Primas, F.; Fuller, G. M. et al. (2002). «The Chemical Composition and Age of the Metal‐poor Halo Star BD +17o3248». The Astrophysical Journal572 (2): 861-879. Bibcode:2002ApJ...572..861C. arXiv:astro-ph/0202429. doi:10.1086/340347.
Bond, H. E.; E. P. Nelan; D. A. VandenBerg; G. H. Schaefer et al. (13 de febrero de 2013). «HD 140283: A Star in the Solar Neighborhood that Formed Shortly After the Big Bang». The Astrophysical Journal765 (1): L12. Bibcode:2013ApJ...765L..12B. arXiv:1302.3180. doi:10.1088/2041-8205/765/1/L12.
Pache, Corinne Ondine (2010). «Hercules». En Gargarin, Michael; Fantham, Elaine, eds. Ancient Greece and Rome. 1: Academy-Bible. Oxford, England: Oxford University Press. p. 400. ISBN978-0-19-538839-8.
Cowan, J. J.; Sneden, C.; Burles, S.; Ivans, I. I.; Beers, T. C.; Truran, J. W.; Lawler, J. E.; Primas, F.; Fuller, G. M. et al. (2002). «The Chemical Composition and Age of the Metal‐poor Halo Star BD +17o3248». The Astrophysical Journal572 (2): 861-879. Bibcode:2002ApJ...572..861C. arXiv:astro-ph/0202429. doi:10.1086/340347.
Bond, H. E.; E. P. Nelan; D. A. VandenBerg; G. H. Schaefer et al. (13 de febrero de 2013). «HD 140283: A Star in the Solar Neighborhood that Formed Shortly After the Big Bang». The Astrophysical Journal765 (1): L12. Bibcode:2013ApJ...765L..12B. arXiv:1302.3180. doi:10.1088/2041-8205/765/1/L12.
Licquia, Timothy; Newman, J. A. (1 de enero de 2012). «What Is the Color of the Milky Way?»219. p. 252.08. Consultado el 27 de septiembre de 2016 – via NASA ADS.
Cowan, J. J.; Sneden, C.; Burles, S.; Ivans, I. I.; Beers, T. C.; Truran, J. W.; Lawler, J. E.; Primas, F.; Fuller, G. M. et al. (2002). «The Chemical Composition and Age of the Metal‐poor Halo Star BD +17o3248». The Astrophysical Journal572 (2): 861-879. Bibcode:2002ApJ...572..861C. arXiv:astro-ph/0202429. doi:10.1086/340347.
Bond, H. E.; E. P. Nelan; D. A. VandenBerg; G. H. Schaefer et al. (13 de febrero de 2013). «HD 140283: A Star in the Solar Neighborhood that Formed Shortly After the Big Bang». The Astrophysical Journal765 (1): L12. Bibcode:2013ApJ...765L..12B. arXiv:1302.3180. doi:10.1088/2041-8205/765/1/L12.
Aguilar, David A. y Christine Pulliam (3 de junio de 2008). «Milky Way's Inner Beauty Revealed». Harvard-Smithsonian. Center for Astrophysics. Consultado el 15 de junio de 2011.