"Google Posts Android 5.1 Factory Images For The Nexus 4, Nexus 7 2013, And Nexus 7 2013 LTE".
Consultado o 19 de xullo de 2012.  "Google Posts Android 5.1 Factory Images For The Nexus 4, Nexus 7 2013, And Nexus 7 2013 LTE".