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"30 Cygni – Variable Star". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Archived from the original on 14 December 2012. Retrieved 31 December 2013.
Kim, J. S.; Kim, S. W.; Kurayama, T.; Honma, M.; Sasao, T.; Kim, S. J. (2013). "Vlbi Observation of Microquasar Cyg X-3 During an X-Ray State Transition from Soft to Hard in the 2007 May-June Flare". The Astrophysical Journal. 772 (1): 41. arXiv:1307.1226. Bibcode:2013ApJ...772...41K. doi:10.1088/0004-637X/772/1/41. S2CID119251416.