Koleva M, Prugniel Ph, Ocvirk P, Le Borgne D, Soubiran C (เมษายน 2008). "Spectroscopic ages and metallicities of stellar populations: validation of full spectrum fitting". Monthly Notices of the Royal Astronomical Society. 385 (4): 1998–2010. doi:10.1111/j.1365-2966.2008.12908.x.
Buell, J. F.; Henry, R. B. C.; Baron, E. & Kwitter, K. B. (กรกฎาคม 1997). "On the origin of planetary nebula k648 in globular cluster m15". The Astrophysical Journal. 483 (2): 837. doi:10.1086/304273.
White, Nicholas E. & Angelini, Lorella (พฤศจิกายน 2001). "The discovery of a second luminous low-mass X-ray binary in the globular cluster M15". The Astrophysical Journal. 561 (1): L101. doi:10.1086/324561.