(en) A. P. Cowley et W. P. Bidelman, « MK spectral types for some F and G stars. », Publications of the Astronomical Society of the Pacific, vol. 91, , p. 83–86 (ISSN0004-6280, DOI10.1086/130446, Bibcode1979PASP...91...83C)
(en) A. P. Cowley et W. P. Bidelman, « MK spectral types for some F and G stars. », Publications of the Astronomical Society of the Pacific, vol. 91, , p. 83–86 (ISSN0004-6280, DOI10.1086/130446, Bibcode1979PASP...91...83C)
(en) A. P. Cowley et W. P. Bidelman, « MK spectral types for some F and G stars. », Publications of the Astronomical Society of the Pacific, vol. 91, , p. 83–86 (ISSN0004-6280, DOI10.1086/130446, Bibcode1979PASP...91...83C)