Kormendy, John & Richstone, Douglas (1995), "Inward Bound—The Search For Supermassive Black Holes In Galactic Nuclei", Annual Review of Astronomy and Astrophysics33: 581, doi:10.1146/annurev.aa.33.090195.003053, Bibcode: {{{bibcode}}}
Frank, Juhan; King, Andrew; Raine, Derek J. (2002 m. sausio mėn.). „Accretion Power in Astrophysics: Third Edition“. Accretion Power in Astrophysics. Kembridžas: Kembridžo universiteto leidykla. Bibcode:2002apa..book.....F. ISBN0521620538.
Kormendy, John & Richstone, Douglas (1995), "Inward Bound—The Search For Supermassive Black Holes In Galactic Nuclei", Annual Review of Astronomy and Astrophysics33: 581, doi:10.1146/annurev.aa.33.090195.003053, Bibcode: {{{bibcode}}}