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G. J. Bendo; R. D. Joseph; M. Wells; P. Gallais; 외. (2002). “An Infrared Space Observatory Atlas of Bright Spiral Galaxies”. 《애스트로노미컬 저널》 123 (6): 3067–3107. Bibcode:2002AJ....123.3067B. doi:10.1086/340083.
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L. Ferrarese; H. C. Ford; J. Huchra; R. C. Kennicutt Jr.; 외. (2000). “A Database of Cepheid Distance Moduli and Tip of the Red Giant Branch, Globular Cluster Luminosity Function, Planetary Nebula Luminosity Function, and Surface Brightness Fluctuation Data Useful for Distance Determinations”. 《애스트로피지컬 저널 서플리먼트》 128 (2): 431–459. arXiv:astro-ph/9910501. Bibcode:2000ApJS..128..431F. doi:10.1086/313391.