Paul B. Eskridge, Jay A. Frogel, Richard W. Pogge et et al., «Near-Infrared and Optical Morphology of Spiral Galaxies», The Astrophysical Journal Supplement Serie, vol.143, no1, , p.73-111 (DOI10.1086/342340, Bibcode2002ApJS..143...73E, lire en ligne[PDF])
A.M. Garcia, «General study of group membership. II - Determination of nearby groups», Astronomy and Astrophysics Supplement Series, vol.100 #1, , p.47-90 (Bibcode1993A&AS..100...47G)
Paul B. Eskridge, Jay A. Frogel, Richard W. Pogge et et al., «Near-Infrared and Optical Morphology of Spiral Galaxies», The Astrophysical Journal Supplement Serie, vol.143, no1, , p.73-111 (DOI10.1086/342340, Bibcode2002ApJS..143...73E, lire en ligne[PDF])
Paul B. Eskridge, Jay A. Frogel, Richard W. Pogge et et al., «Near-Infrared and Optical Morphology of Spiral Galaxies», The Astrophysical Journal Supplement Serie, vol.143, no1, , p.73-111 (DOI10.1086/342340, Bibcode2002ApJS..143...73E, lire en ligne[PDF])