Hipparcos (页面存档备份,存于互联网档案馆), Staffan Söderhjelm, Astronomy and Astrophysics 341(January 1999),pp. 121–140. Barnard'sStar and the M Dwarf Temperature Scale
Science fiction story released with the announcement of planetary system, Jun 4, 2014 [2014-06-04], (原始内容存档于2014-06-06) SolStation.com: Kapteyn'sStar(页面存档备份,存于互联网档案馆)
Dragonby Press. March 1999: 15. Cook, Michael. Narratives of Enclosure in Detective Fiction: The Locked Room Mystery. Palgrave Macmillan UK. 12 October 2011: