^pp. 723–724, The Observer's Guide to Astronomy: Volume 1, Patrick Martinez and Storm Dunlop, Cambridge University Press, 1994,
ISBN0-521-45898-6.
^Index catalogue of visual double stars, 1961.0, Hamilton M. Jeffers, Willem H. van den Bos, and Frances M. Greeby, Publications of the Lick Observatory, Mount Hamilton: University of California, Lick Observatory, 1963,
Bibcode:
1963icvd.book.....J.