User:SOTO/Forum Archive/Inclusion debates/@comment-45692830-20200723133026/@comment-43874324-20200723185936
From Tardis Wiki, the free Doctor Who reference
I'm not too sure about the notion of the book existing in-universe. The short story and the jokes are being presented to us, the reader, as the Knock! Knock! Who's There? joke book, but that doesn't necessarily mean that's also the books title in-narrative. All that's said is they're trapped "in a joke book", with no mention of a title.