Book (The Whoniverse)
From Tardis Wiki, the free Doctor Who reference
A book covered the history of N-Space, discussing events from Event One, briefly touching on beings that may have come from before the creation of N-Space, all the way to what remained of creation mere moments away from the end of the universe. According to the book, what remained in the universe at this time were several scattered immortals and Gallifrey. (PROSE: The Whoniverse)