de Vaucouleurs G, de Vaucouleurs A., Corwin H.G., Buta R.J., Paturel G., Fouque P., 1991, Third reference Catalog of Bright Galaxies (New York: Springer-Verlag)
Loose H.H., & Thuan T.X., 1985, in Star-Forming Dwarf Galaxies and Related Objects, ed. D. Kunth, T.X. Thuan, & T.T. Van (Paris: Editions Frontiéres), 73