Planck Collaboration (2020). „Planck 2018 results. VI. Cosmological parameters”. Astronomy & Astrophysics. 641. page A6 (see PDF page 15, Table 2: "Age/Gyr", last column). S2CID119335614. arXiv:1807.06209. doi:10.1051/0004-6361/201833910.
Riess, Adam G.; Casertano, Stefano; Yuan, Wenlong; Macri, Lucas; Bucciarelli, Beatrice; Lattanzi, Mario G.; et al. (2018-07-12). „Milky Way cepheid standards for measuring cosmic distances and application to Gaia DR2: Implications for the Hubble constant”. The Astrophysical Journal. 861 (2): 126. Bibcode:2018ApJ...861..126R. ISSN1538-4357. S2CID55643027. arXiv:1804.10655. doi:10.3847/1538-4357/aac82e.
Freedman, Wendy L.; Madore, Barry F.; Hatt, Dylan; Hoyt, Taylor J.; Jang, In-Sung; Beaton, Rachael L.; et al. (2019-08-29). „The Carnegie-Chicago Hubble Program. VIII. An independent determination of the Hubble constant based on the tip of the red giant branch”. The Astrophysical Journal. 882 (1): 34. Bibcode:2019ApJ...882...34F. ISSN1538-4357. S2CID196623652. arXiv:1907.05922. doi:10.3847/1538-4357/ab2f73.
Planck Collaboration (2020). „Planck 2018 results. VI. Cosmological parameters”. Astronomy & Astrophysics. 641. page A6 (see PDF page 15, Table 2: "Age/Gyr", last column). S2CID119335614. arXiv:1807.06209. doi:10.1051/0004-6361/201833910.
Riess, Adam G.; Casertano, Stefano; Yuan, Wenlong; Macri, Lucas; Bucciarelli, Beatrice; Lattanzi, Mario G.; et al. (2018-07-12). „Milky Way cepheid standards for measuring cosmic distances and application to Gaia DR2: Implications for the Hubble constant”. The Astrophysical Journal. 861 (2): 126. Bibcode:2018ApJ...861..126R. ISSN1538-4357. S2CID55643027. arXiv:1804.10655. doi:10.3847/1538-4357/aac82e.
Freedman, Wendy L.; Madore, Barry F.; Hatt, Dylan; Hoyt, Taylor J.; Jang, In-Sung; Beaton, Rachael L.; et al. (2019-08-29). „The Carnegie-Chicago Hubble Program. VIII. An independent determination of the Hubble constant based on the tip of the red giant branch”. The Astrophysical Journal. 882 (1): 34. Bibcode:2019ApJ...882...34F. ISSN1538-4357. S2CID196623652. arXiv:1907.05922. doi:10.3847/1538-4357/ab2f73.
Riess, Adam G.; Casertano, Stefano; Yuan, Wenlong; Macri, Lucas; Bucciarelli, Beatrice; Lattanzi, Mario G.; et al. (2018-07-12). „Milky Way cepheid standards for measuring cosmic distances and application to Gaia DR2: Implications for the Hubble constant”. The Astrophysical Journal. 861 (2): 126. Bibcode:2018ApJ...861..126R. ISSN1538-4357. S2CID55643027. arXiv:1804.10655. doi:10.3847/1538-4357/aac82e.
Freedman, Wendy L.; Madore, Barry F.; Hatt, Dylan; Hoyt, Taylor J.; Jang, In-Sung; Beaton, Rachael L.; et al. (2019-08-29). „The Carnegie-Chicago Hubble Program. VIII. An independent determination of the Hubble constant based on the tip of the red giant branch”. The Astrophysical Journal. 882 (1): 34. Bibcode:2019ApJ...882...34F. ISSN1538-4357. S2CID196623652. arXiv:1907.05922. doi:10.3847/1538-4357/ab2f73.
Planck Collaboration (2020). „Planck 2018 results. VI. Cosmological parameters”. Astronomy & Astrophysics. 641. page A6 (see PDF page 15, Table 2: "Age/Gyr", last column). S2CID119335614. arXiv:1807.06209. doi:10.1051/0004-6361/201833910.
Riess, Adam G.; Casertano, Stefano; Yuan, Wenlong; Macri, Lucas; Bucciarelli, Beatrice; Lattanzi, Mario G.; et al. (2018-07-12). „Milky Way cepheid standards for measuring cosmic distances and application to Gaia DR2: Implications for the Hubble constant”. The Astrophysical Journal. 861 (2): 126. Bibcode:2018ApJ...861..126R. ISSN1538-4357. S2CID55643027. arXiv:1804.10655. doi:10.3847/1538-4357/aac82e.
Freedman, Wendy L.; Madore, Barry F.; Hatt, Dylan; Hoyt, Taylor J.; Jang, In-Sung; Beaton, Rachael L.; et al. (2019-08-29). „The Carnegie-Chicago Hubble Program. VIII. An independent determination of the Hubble constant based on the tip of the red giant branch”. The Astrophysical Journal. 882 (1): 34. Bibcode:2019ApJ...882...34F. ISSN1538-4357. S2CID196623652. arXiv:1907.05922. doi:10.3847/1538-4357/ab2f73.
Riess, Adam G.; Casertano, Stefano; Yuan, Wenlong; Macri, Lucas; Bucciarelli, Beatrice; Lattanzi, Mario G.; et al. (2018-07-12). „Milky Way cepheid standards for measuring cosmic distances and application to Gaia DR2: Implications for the Hubble constant”. The Astrophysical Journal. 861 (2): 126. Bibcode:2018ApJ...861..126R. ISSN1538-4357. S2CID55643027. arXiv:1804.10655. doi:10.3847/1538-4357/aac82e.
Freedman, Wendy L.; Madore, Barry F.; Hatt, Dylan; Hoyt, Taylor J.; Jang, In-Sung; Beaton, Rachael L.; et al. (2019-08-29). „The Carnegie-Chicago Hubble Program. VIII. An independent determination of the Hubble constant based on the tip of the red giant branch”. The Astrophysical Journal. 882 (1): 34. Bibcode:2019ApJ...882...34F. ISSN1538-4357. S2CID196623652. arXiv:1907.05922. doi:10.3847/1538-4357/ab2f73.