Mould, Jeremy R. (2000). "The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XXVIII. Combining the Constraints on the Hubble Constant". The Astrophysical Journal. ج. 529 ع. 2: 786–794. arXiv:astro-ph/9909260. Bibcode:2000ApJ...529..786M. DOI:10.1086/308304.
Mould, Jeremy R. (2000). "The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XXVIII. Combining the Constraints on the Hubble Constant". The Astrophysical Journal. ج. 529 ع. 2: 786–794. arXiv:astro-ph/9909260. Bibcode:2000ApJ...529..786M. DOI:10.1086/308304.
Mould, Jeremy R. (2000). "The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XXVIII. Combining the Constraints on the Hubble Constant". The Astrophysical Journal. ج. 529 ع. 2: 786–794. arXiv:astro-ph/9909260. Bibcode:2000ApJ...529..786M. DOI:10.1086/308304.