^ 1.01.11.21.31.41.5NASA/IPAC Extragalactic Database. Results for NGC 4945. [2006-11-25]. (原始内容存档于2011-05-14).
^ 2.02.1I. D. Karachentsev, M. E. Sharina, A. E. Dolphin, E. K. Grebel, D. Geisler, P. Guhathakurta, P. W. Hodge, V. E. Karachentseva, A. Sarajedini, P. Seitzer. New distances to galaxies in the Centaurus A group. Astronomy and Astrophysics. 2002, 385: 21–31 [2020-09-26]. doi:10.1051/0004-6361:20020042. (原始内容存档于2018-11-22).
^ 3.03.1Les données de «Revised NGC and IC Catalog by Wolfgang Steinicke» sur le site ProfWeb, NGC 4900 à 4999 (法语).
^I. D. Karachentsev. The Local Group and Other Neighboring Galaxy Groups. Astronomical Journal. 2005, 129: 178–188 [2011-01-27]. doi:10.1086/426368. (原始内容存档于2008-02-21).