Richardson, N. D.; Morrison, N. D.; Kryukova, E. E.; Adelman, S. J. (janeiro de 2011). «A Five-year Spectroscopic and Photometric Campaign on the Prototypical α Cygni Variable and A-type Supergiant Star Deneb». The Astronomical Journal. 141 (1): artigo 17, 9. Bibcode:2011AJ....141...17R. doi:10.1088/0004-6256/141/1/17
Richardson, N. D.; Morrison, N. D.; Kryukova, E. E.; Adelman, S. J. (janeiro de 2011). «A Five-year Spectroscopic and Photometric Campaign on the Prototypical α Cygni Variable and A-type Supergiant Star Deneb». The Astronomical Journal. 141 (1): artigo 17, 9. Bibcode:2011AJ....141...17R. doi:10.1088/0004-6256/141/1/17