(en) A. Treves, P. Bouchet, L. Chiappetti et A. Ciapi, « The X-Ray to Infrared Energy Distribution of the Quasar PG 0026+129 », The Astrophysical Journal, vol. 330, , p. 178 (ISSN0004-637X, DOI10.1086/166464, Bibcode1988ApJ...330..178T)
(en) Charles H. Nelson, « Black Hole Mass, Velocity Dispersion, and the Radio Source in Active Galactic Nuclei », The Astrophysical Journal, vol. 544, , L91–L94 (ISSN0004-637X, DOI10.1086/317314, Bibcode2000ApJ...544L..91N)
(en) A. Treves, P. Bouchet, L. Chiappetti et A. Ciapi, « The X-Ray to Infrared Energy Distribution of the Quasar PG 0026+129 », The Astrophysical Journal, vol. 330, , p. 178 (ISSN0004-637X, DOI10.1086/166464, Bibcode1988ApJ...330..178T)
(en) Charles H. Nelson, « Black Hole Mass, Velocity Dispersion, and the Radio Source in Active Galactic Nuclei », The Astrophysical Journal, vol. 544, , L91–L94 (ISSN0004-637X, DOI10.1086/317314, Bibcode2000ApJ...544L..91N)
(en) A. Treves, P. Bouchet, L. Chiappetti et A. Ciapi, « The X-Ray to Infrared Energy Distribution of the Quasar PG 0026+129 », The Astrophysical Journal, vol. 330, , p. 178 (ISSN0004-637X, DOI10.1086/166464, Bibcode1988ApJ...330..178T)
(en) Charles H. Nelson, « Black Hole Mass, Velocity Dispersion, and the Radio Source in Active Galactic Nuclei », The Astrophysical Journal, vol. 544, , L91–L94 (ISSN0004-637X, DOI10.1086/317314, Bibcode2000ApJ...544L..91N)