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Levato, O. H. (August 1972), "Rotational Velocities and Spectral Types of Some A-Type Stars", Publications of the Astronomical Society of the Pacific, 84 (500): 584, Bibcode:1972PASP...84..584L, doi:10.1086/129336
Wolff, Sidney Carne (October 1967), "A Spectroscopic and Photometric Study of the AP Stars", Astrophysical Journal Supplement, 15: 21, Bibcode:1967ApJS...15...21W, doi:10.1086/190162