(en) R. O. Gray, M. G. Napier et L. I. Winkler, « The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars », The Astronomical Journal, vol. 121, no 4, , p. 2148–2158 (DOI10.1086/319956, Bibcode2001AJ....121.2148G)
(en) R. O. Gray, M. G. Napier et L. I. Winkler, « The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars », The Astronomical Journal, vol. 121, no 4, , p. 2148–2158 (DOI10.1086/319956, Bibcode2001AJ....121.2148G)
Samus, O. V. Durlevichet al., « VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013) », VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S, vol. 1, (Bibcode2009yCat....102025S)