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Maybhate, Aparna; Goudfrooij, Paul; Schweizer, François; Puzia, Thomas; Carter, David (2007). »Evidence for Three Subpopulations of Globular Clusters in the Early-Type Poststarburst Shell Galaxy AM«. Astronomical Journal. 1729. Zv. 134, št. 5. str. 139–655. arXiv:0707.3133. Bibcode:2007AJ....134.1729M. doi:10.1086/521817.
Maybhate, Aparna; Goudfrooij, Paul; Schweizer, François; Puzia, Thomas; Carter, David (2007). »Evidence for Three Subpopulations of Globular Clusters in the Early-Type Poststarburst Shell Galaxy AM«. Astronomical Journal. 1729. Zv. 134, št. 5. str. 139–655. arXiv:0707.3133. Bibcode:2007AJ....134.1729M. doi:10.1086/521817.