I can't answer the query, but am busy trying to think of other examples of the same phenomenon. The Hitch-Hiker's Guide To The Galaxy leapt to mind immediately, and M.R. James' short story 'The Tractate Middoth' also presented itself after some thought. But then I got stuck. I'm sure there must be plenty more along the lines of the latter in particular, though, in which the titular book serves as an object of quest and / or a portal into another world. If no established term exists for the phenomenon, could we simply call them autoreferential?