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Ronald J. Buta, Gene G. Byrd et Tarsh Freeman, « The Ringed Spiral Galaxy NGC 4622. I. Photometry, Kinematics, and the Case for Two Strong Leading Outer Spiral Arms », The Astronomical Journal, vol. 125, no 2, , p. 634-666 (DOI10.1086/345821, Bibcode2003AJ....125..634B, lire en ligne [PDF])
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H. Jerjen et A. Dressler, « Studies of the Centaurus cluster. I. A catalogue of galaxies in the central region of the Centaurus cluster », A & A Supplement series, vol. 124, , p. 1-12 (DOI10.1051/aas:1997355, lire en ligne [PDF])
Ronald J. Buta, Gene G. Byrd et Tarsh Freeman, « The Ringed Spiral Galaxy NGC 4622. I. Photometry, Kinematics, and the Case for Two Strong Leading Outer Spiral Arms », The Astronomical Journal, vol. 125, no 2, , p. 634-666 (DOI10.1086/345821, Bibcode2003AJ....125..634B, lire en ligne [PDF])
Gene G. Byrd, Tarsh Freeman, Sethanne Howard et Ronald J. Buta, « The Ringed Spiral Galaxy NGC4622. II. An Independent Determination that the Two Outer Arms Lead », The Astronomical Journal, vol. 135, no 1, , p. 408-413 (DOI10.1088/0004-6256/135/1/408, Bibcode2008AJ....135..408B, lire en ligne [PDF])
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Gene G. Byrd, Tarsh Freeman, Sethanne Howard et Ronald J. Buta, « The Ringed Spiral Galaxy NGC4622. II. An Independent Determination that the Two Outer Arms Lead », The Astronomical Journal, vol. 135, no 1, , p. 408-413 (DOI10.1088/0004-6256/135/1/408, Bibcode2008AJ....135..408B, lire en ligne [PDF])