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Haddock, F.T.; Howard, W.E. III; Malville, J.M.; Selling, T.V. (October 1963). «An Upper Limit to the 8000 Mc/S Flux Density of Nova Herculis 1963». Publications of the Astronomical Society of the Pacific75 (446): 456. Bibcode:1963PASP...75..456H. doi:10.1086/128005.
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Thorstensen, John R.; Taylor, Cynthia J. (March 2000). «Spectroscopy and orbital periods of the old novae V533 Herculis, V446 Herculis and X Serpentis». Monthly Notices of the Royal Astronomical Society312 (3): 629-637. Bibcode:2000MNRAS.312..629T. doi:10.1046/j.1365-8711.2000.03230.x.