↑ ab et cT. Oja, « UBV photometry of stars whose positions are accurately known. VI », Astronomy and Astrophysics Supplement Series, , p. 415–419 (Bibcode1991A&AS...89..415O)
↑ a et bWilliam P. Bidelman, « Spectral Classification of Visual Binaries Having Primaries Above the Main Sequence », Publications of the Astronomical Society of the Pacific, (DOI10.1086/127203, Bibcode1958PASP...70..168B)