Hopkins, Philip F.; Richards, Gordon T.; Hernquist, Lars (2007). “An Observational Determination of the Bolometric Quasar Luminosity Function”. The Astrophysical Journal654 (2): 731–753. doi:10.1086/509629. ISSN0004-637X.
Willott, Chris (2011). “Cosmology: A monster in the early Universe”. Nature474 (7353): 583–584. doi:10.1038/474583a. ISSN0028-0836.
Steve Warren, Daniel Mortlock, et al. (05/2011). “Photometry of the z=7.08 quasar ULAS J1120+0641”. Spitzer Proposals80114. Bibcode: 2011sptz.prop80114W.
Hopkins, Philip F.; Richards, Gordon T.; Hernquist, Lars (2007). “An Observational Determination of the Bolometric Quasar Luminosity Function”. The Astrophysical Journal654 (2): 731–753. doi:10.1086/509629. ISSN0004-637X.
Willott, Chris (2011). “Cosmology: A monster in the early Universe”. Nature474 (7353): 583–584. doi:10.1038/474583a. ISSN0028-0836.