van den Bergh, Sidney; Mackey, A. D. (2004). «Globular clusters and the formation of the outer Galactic halo». Monthly Notices of the Royal Astronomical Society354 (3): 713–719. doi:10.1111/j.1365-2966.2004.08228.x. Bibcode: 2004MNRAS.354..713V.
RIPEPI V.; CLEMENTINI G.; DI CRISCIENZO M.; GRECO C. και άλλοι. (2007). «On the remote galactic globular cluster NGC 2419.». The Astrophysical Journal667: L61–L64. doi:10.1086/522000. Bibcode: 2007ApJ...667L..61R.
van den Bergh, Sidney; Mackey, A. D. (2004). «Globular clusters and the formation of the outer Galactic halo». Monthly Notices of the Royal Astronomical Society354 (3): 713–719. doi:10.1111/j.1365-2966.2004.08228.x. Bibcode: 2004MNRAS.354..713V.
RIPEPI V.; CLEMENTINI G.; DI CRISCIENZO M.; GRECO C. και άλλοι. (2007). «On the remote galactic globular cluster NGC 2419.». The Astrophysical Journal667: L61–L64. doi:10.1086/522000. Bibcode: 2007ApJ...667L..61R.