G. de Vaucouleurs; A. de Vaucouleurs; H.G. Corwin; R.J. Buta; G. Paturel; P. Fouque (1991). Third Reference Catalogue of Bright Galaxies. Volume I: Explanations and references. Volume II: Data for galaxies between 0h and 12h. Volume III: Data for galaxies between 12h and 24h. Springer, New York. p. 2091. Bibcode:1991rc3..book.....D. ISBN978-0-387-97552-8.