Doctor Who's Time Flight (in-universe)

 was a book that was cited when the Eighth Doctor mentioned that he was unsure if he was a renegade, a President, exiled to Earth or his homeworld, whether he had a mother or whether he had been processed out of some diabolical gene-splicing machine, or if it had all been some peculiar distraction or fantasy. (PROSE: Bafflement and Devotion)