McMillan, R.S.; Smith, P.H.; Moore, T.L.; Perry, M.L. Variation of the radial velocity of Epsilon Cygni A. „Publications of the Astronomical Society of the Pacific”. 104 (682), s. 1173–1176, 1992. DOI: 10.1086/133105. ISSN0004-6280. Bibcode: 1992PASP..104.1173M.
harvard.edu
adsabs.harvard.edu
McMillan, R.S.; Smith, P.H.; Moore, T.L.; Perry, M.L. Variation of the radial velocity of Epsilon Cygni A. „Publications of the Astronomical Society of the Pacific”. 104 (682), s. 1173–1176, 1992. DOI: 10.1086/133105. ISSN0004-6280. Bibcode: 1992PASP..104.1173M.
iau.org
Naming Stars. Międzynarodowa Unia Astronomiczna, 2018-06-01. [dostęp 2018-08-19].
McMillan, R.S.; Smith, P.H.; Moore, T.L.; Perry, M.L. Variation of the radial velocity of Epsilon Cygni A. „Publications of the Astronomical Society of the Pacific”. 104 (682), s. 1173–1176, 1992. DOI: 10.1086/133105. ISSN0004-6280. Bibcode: 1992PASP..104.1173M.