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Campbell, W. W.; Wright, W. H. (1900). “A list of nine stars whose velocities in the line of sight are variable.”. The Astrophysical Journal12: 256. doi:10.1086/140765. ISSN0004-637X.
Sterne, T. E. (1938). “The Secondary Variation of δ Scuti”. The Astrophysical Journal87: 133. doi:10.1086/143913. ISSN0004-637X.
Wagman, M. (August 1987). “Flamsteed's Missing Stars”. Journal for the History of Astronomy, Vol.18, NO. 3/AUG, P.209, 198718: 212. Bibcode: 1987JHA....18..209W.
Colacevich, A. (1935). “On the Variable Radial Velocity of δ Scuti”. Publications of the Astronomical Society of the Pacific47: 231-232. doi:10.1086/124599. ISSN0004-6280.
Campbell, W. W.; Wright, W. H. (1900). “A list of nine stars whose velocities in the line of sight are variable.”. The Astrophysical Journal12: 256. doi:10.1086/140765. ISSN0004-637X.
Sterne, T. E. (1938). “The Secondary Variation of δ Scuti”. The Astrophysical Journal87: 133. doi:10.1086/143913. ISSN0004-637X.