New General Catalog Objects: NGC 50 - 99. cseligman.com [online]. [cit. 2022-04-27]. Dostupné online.
doi.org
Elaine Sadler, Matthew Colless, Leela Frankcombe, John R. Lucey, Scott M. Croom, Ofer Lahav, Quentin Parker: The 6dF Galaxy Survey: final redshift release (DR3) and southern large-scale structures. In: Monthly Notices of the Royal Astronomical Society. 21. října 2009. DOI10.1111/J.1365-2966.2009.15338.X.
Thomas H. Jarrett, John M. Carpenter, John E. Gizis, Carol Lonsdale: The Two Micron All Sky Survey (2MASS). In: The Astronomical Journal. únor 2006. DOI10.1086/498708.