"Kerberos Revealed". pluto.jhuapl.edu. NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute. October 22, 2015. Archived from the original on October 29, 2018. Retrieved October 22, 2015.
"Kerberos Revealed". pluto.jhuapl.edu. NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute. October 22, 2015. Archived from the original on October 29, 2018. Retrieved October 22, 2015.