The Visual Orbit, the Stellar Diameter and the Magnitude Difference of the Spectroscopic Binary β Herculis, X. P. Pan, M. Shao, M. M. Colavita, B. E. Hines, J. T. Armstrong, C. S. Denisson, M. Vivekanand, D. Mozurkewich, R. S. Simon, K. J. Johnston, Bulletin of the American Astronomical Society22 (September 1990), p. 1335, Bibcode:1990BAAS...22R1335P.
The orbit of β Herculis, H. C. Plummer, Lick Observatory Bulletin5 (1908), pp. 24–26, Bibcode:1908LicOB...5...24P.
The digital speckle interferometer: preliminary results on 59 stars and 3C 27, A. Blazit, D. Bonneau, L. Koechlin, and A. Labeyrie, Astrophysical Journal Letters214 (June 1, 1977), pp. L79–L84, Bibcode:1977ApJ...214L..79B.
HR 6148, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 18, 2008.
HR 6148, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 18, 2008.