Guinan, Edward F.; Engle, Scott G.; Durbin, Allyn. Living with a Red Dwarf: Rotation and X-Ray and Ultraviolet Properties of the Halo Population Kapteyn's Star. „The Astrophysical Journal”. 821 (2), s. 14, 2016. DOI: 10.3847/0004-637X/821/2/81. arXiv:1602.01912. Bibcode: 2016ApJ...821...81G. 81. (ang.).
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Guinan, Edward F.; Engle, Scott G.; Durbin, Allyn. Living with a Red Dwarf: Rotation and X-Ray and Ultraviolet Properties of the Halo Population Kapteyn's Star. „The Astrophysical Journal”. 821 (2), s. 14, 2016. DOI: 10.3847/0004-637X/821/2/81. arXiv:1602.01912. Bibcode: 2016ApJ...821...81G. 81. (ang.).
B.-O. Demory et al.. Mass-radius relation of low and very low-mass stars revisited with the VLTI. „Astronomy & Astrophysics”. 505 (1), s. 205-215, 2009. DOI: 10.1051/0004-6361/200911976. (ang.).
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Kapteyn's c w serwisie The Extrasolar Planets Encyclopaedia (ang.)
Kapteyn's b w serwisie The Extrasolar Planets Encyclopaedia (ang.)
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Guinan, Edward F.; Engle, Scott G.; Durbin, Allyn. Living with a Red Dwarf: Rotation and X-Ray and Ultraviolet Properties of the Halo Population Kapteyn's Star. „The Astrophysical Journal”. 821 (2), s. 14, 2016. DOI: 10.3847/0004-637X/821/2/81. arXiv:1602.01912. Bibcode: 2016ApJ...821...81G. 81. (ang.).