Lesh, Janet Rountree (dezembro de 1968), «The Kinematics of the Gould Belt: an Expanding Group?», Astrophysical Journal Supplement, 17: 371, Bibcode:1968ApJS...17..371L, doi:10.1086/190179
Adelman, Saul J. (junho de 1998). «Elemental abundance analyses with DAO spectrograms - XIX. The superficially normal B stars zeta Draconis, epsilon Lyrae, 8 Cygni and 22 Cygni». Monthly Notices of the Royal Astronomical Society. 296 (4): 856–862. Bibcode:1998MNRAS.296..856A. doi:10.1046/j.1365-8711.1998.01426.x
Lesh, Janet Rountree (dezembro de 1968), «The Kinematics of the Gould Belt: an Expanding Group?», Astrophysical Journal Supplement, 17: 371, Bibcode:1968ApJS...17..371L, doi:10.1086/190179
Adelman, Saul J. (junho de 1998). «Elemental abundance analyses with DAO spectrograms - XIX. The superficially normal B stars zeta Draconis, epsilon Lyrae, 8 Cygni and 22 Cygni». Monthly Notices of the Royal Astronomical Society. 296 (4): 856–862. Bibcode:1998MNRAS.296..856A. doi:10.1046/j.1365-8711.1998.01426.x