(en) P. M. Corben et R. H. Stoy, « Photoelectric Magnitudes and Colours for Bright Southern Stars », Monthly Notes of the Astronomical Society of Southern Africa, vol. 27, , p. 11 (Bibcode1968MNSSA..27...11C)
(en) N. Houk et C. Swift, « Michigan catalogue of two-dimensional spectral types for the HD Stars », Michigan Spectral Survey, (Bibcode1999MSS...C05....0H)