↑Proctor, Richard Anthony (1879). Half-hours with the Telescope: A Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction (به انگلیسی). G. P. Putnam's sons.
↑Kazarovets, E. V; Samus, N. N; Durlevich, O. V (2000). "The 75th Name-List of Variable Stars". Information Bulletin on Variable Stars. 4870: 1. Bibcode:2000IBVS.4870....1K.
↑Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.