H. L. Johnson et al., UBVRIJKL photometry of the bright stars, in Communications of the Lunar and Planetary Laboratory, vol. 4, n. 99, 1966, pp. 99, Bibcode:1966CoLPL...4...99J.
Nancy Houk et al., Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Dept. of Astronomy, University of Michigan, 1978, Bibcode:1978mcts.book.....H.
M. Jerzykiewicz e C. Sterken, Three periodic variables of early B spectral type, in Astronomy and Astrophysics, vol. 261, n. 2, Agosto 1992, pp. 477-481, Bibcode:1992A&A...261..477J.