Howell, Steve B.; Rector, Travis A.; Walter, Donald (2013). Optical Spectroscopy at Deep Light Minimum of R Coronae Borealis. Publications of the Astronomical Society of the Pacific. 125 (930): 879–888. Bibcode:2013PASP..125..879H. doi:10.1086/672163. S2CID120129277.
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Howell, Steve B.; Rector, Travis A.; Walter, Donald (2013). Optical Spectroscopy at Deep Light Minimum of R Coronae Borealis. Publications of the Astronomical Society of the Pacific. 125 (930): 879–888. Bibcode:2013PASP..125..879H. doi:10.1086/672163. S2CID120129277.
Watson, C. L. (2006). The International Variable Star Index (VSX). The Society for Astronomical Sciences 25th Annual Symposium on Telescope Science. Held May 23–25. 25: 47. Bibcode:2006SASS...25...47W.
Howell, Steve B.; Rector, Travis A.; Walter, Donald (2013). Optical Spectroscopy at Deep Light Minimum of R Coronae Borealis. Publications of the Astronomical Society of the Pacific. 125 (930): 879–888. Bibcode:2013PASP..125..879H. doi:10.1086/672163. S2CID120129277.