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WikiPedia: 61_Cygni http://www.astro.utoronto.ca/~garrison/mkstds.html http://www.skyandtelescope.com/observing/more-pret... http://www.solstation.com/stars/61cygni2.htm http://www.solstation.com/stars2/pimensae.htm http://joy.chara.gsu.edu/RECONS/TOP100.posted.htm http://hyperphysics.phy-astr.gsu.edu/hbase/Starlog... http://adsabs.harvard.edu/abs/1838AN.....16...65B http://adsabs.harvard.edu/abs/1898ApJ.....8..246D http://adsabs.harvard.edu/abs/1911AJ.....27...33B http://adsabs.harvard.edu/abs/1916JRASC..10..498H