Knock! Knock! Who's There? Joke Book

'Knock! Knock! Who's There? Joke Book' was a Doctor Who based joke book written for children and released by BBC Children's Books.

Publisher's summary
Climb aboard the TARDIS for a journey through space, time, and comedy in the official Doctor Who joke book! -What do we want? -TIME TRAVEL! -When do we want it? -THAT'S IRRELEVANT! Packed with a dimensionally transcendent TARDIS-load amount of jokes, gags and riddles, this is the official Doctor Who joke book! Remember: it's funnier on the inside!