Buie, M. W.; Grundy, W. M.; Young, E. F.; Young, L. A.; and Stern, S. A. (2006). «Orbits and Photometry of Pluto's satellites: Charon, S/2005 P1, and S/2005 P2 [sic]». Astronomical Journal. 132. 290 páginas. doi:10.1086/504422A referência emprega parâmetros obsoletos |coautor= (ajuda)(Final preprint) a, i, e per JPL (site updated 2008 Aug 25)
Stern, S. A.; Mutchler, M. J.; Weaver, H. A.; Steffl, A. J. (2006). «The Positions, Colors, and Photometric Variability of Pluto's Small Satellites from HST Observations 2005–2006». Astronomical Journal. 132 (3): 1405–1414. Bibcode:2006AJ....132.1405S. arXiv:astro-ph/0605014. doi:10.1086/506347
Buie, M. W.; Grundy, W. M.; Young, E. F.; Young, L. A.; and Stern, S. A. (2006). «Orbits and Photometry of Pluto's satellites: Charon, S/2005 P1, and S/2005 P2 [sic]». Astronomical Journal. 132. 290 páginas. doi:10.1086/504422A referência emprega parâmetros obsoletos |coautor= (ajuda)(Final preprint) a, i, e per JPL (site updated 2008 Aug 25)
Stern, S. A.; Mutchler, M. J.; Weaver, H. A.; Steffl, A. J. (2006). «The Positions, Colors, and Photometric Variability of Pluto's Small Satellites from HST Observations 2005–2006». Astronomical Journal. 132 (3): 1405–1414. Bibcode:2006AJ....132.1405S. arXiv:astro-ph/0605014. doi:10.1086/506347
Stern, S. A.; Mutchler, M. J.; Weaver, H. A.; Steffl, A. J. (2006). «The Positions, Colors, and Photometric Variability of Pluto's Small Satellites from HST Observations 2005–2006». Astronomical Journal. 132 (3): 1405–1414. Bibcode:2006AJ....132.1405S. arXiv:astro-ph/0605014. doi:10.1086/506347
Buie, M. W.; Grundy, W. M.; Young, E. F.; Young, L. A.; and Stern, S. A. (2006). «Orbits and Photometry of Pluto's satellites: Charon, S/2005 P1, and S/2005 P2 [sic]». Astronomical Journal. 132. 290 páginas. doi:10.1086/504422A referência emprega parâmetros obsoletos |coautor= (ajuda)(Final preprint) a, i, e per JPL (site updated 2008 Aug 25)