Toshiko Sato scanned the book with an alien data scanner salvaged by Torchwood Three. She then attached the scanner to her computer, and was able to read the book on the screen. (TV: Everything Changes)
Behind the scenes Edit
In AUDIO: The Crooked Man, the Fourth Doctor reads out loud the opening line from a ripped page of A Tale of Two Cities: "It was the best of times, it was the worst of times." Though he identifies the passage as Dickens, the Doctor does not name the book it comes from.