Eggen, O. J. (1959). "White dwarf members of the 61 Cygni group". The Observatory. 79: 135–39. Diarsipkan dari versi asli tanggal 2017-11-14. Diakses tanggal 2007-07-17. – Gives space velocity components of U=+94, V=-53 and W=-7 for HD 201091/2.
web.archive.org
Eggen, O. J. (1959). "White dwarf members of the 61 Cygni group". The Observatory. 79: 135–39. Diarsipkan dari versi asli tanggal 2017-11-14. Diakses tanggal 2007-07-17. – Gives space velocity components of U=+94, V=-53 and W=-7 for HD 201091/2.