J. L. Tonry; A. Dressler; J. P. Blakeslee; E. A. Ajhar; et al. (2001): The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances. In: Astrophysical Journal. Nr.546 (2), S.681–693, doi:10.1086/318301, bibcode:2001ApJ...546..681T.
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J. L. Tonry; A. Dressler; J. P. Blakeslee; E. A. Ajhar; et al. (2001): The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances. In: Astrophysical Journal. Nr.546 (2), S.681–693, doi:10.1086/318301, bibcode:2001ApJ...546..681T.