APA (7th ed.) Citation

Archbold, T. (2013). Knock knock!: The best knock knock jokes ever! Macmillan Children's Books.

Chicago Style (17th ed.) Citation

Archbold, Tim. Knock Knock!: The Best Knock Knock Jokes Ever! London: Macmillan Children's Books, 2013.

MLA (9th ed.) Citation

Archbold, Tim. Knock Knock!: The Best Knock Knock Jokes Ever! Macmillan Children's Books, 2013.

Warning: These citations may not always be 100% accurate.