Innes, R.T.A. (1917). "Parallax of the Faint Proper Motion Star Near Alpha of Centaurus". Circular of the Union Observatory Johannesburg. 40: 331–336. Bibcode:1917CiUO...40..331I.
Van De Kamp, P. (1930). "List of stars nearer than five parsecs". Popular Astronomy. 38: 17. Bibcode:1930PA.....38...17V.