↑ Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin (849): 11–14, Bibcode :1927BHarO.849...11S . ↑ ۲٫۰ ۲٫۱ Goldsbury, Ryan; et al. (December 2010), "The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters", The Astronomical Journal , 140 (6): 1830–1837, arXiv :1008.2755 Bibcode :2010AJ....140.1830G , doi :10.1088/0004-6256/140/6/1830 . ↑ ۳٫۰ ۳٫۱ Boyles, J.; et al. (November 2011), "Young Radio Pulsars in Galactic Globular Clusters", The Astrophysical Journal , 742 (1): 51, arXiv :1108.4402 Bibcode :2011ApJ...742...51B , doi :10.1088/0004-637X/742/1/51 . ↑ ۴٫۰ ۴٫۱ "SIMBAD Astronomical Object Database" . Results for NGC 6171 . Retrieved 2006-11-16 .↑ distance × sin(diameter_angle / 2)=39.5 ly. radius
↑ ۶٫۰ ۶٫۱ Forbes, Duncan A.; Bridges, Terry (May 2010), "Accreted versus in situ Milky Way globular clusters", Monthly Notices of the Royal Astronomical Society 404 (3): 1203–1214, arXiv :1001.4289 Bibcode :2010MNRAS.404.1203F , doi :10.1111/j.1365-2966.2010.16373.x .
