APA (7th ed.) Citation

Tim Cooke. (2012). How to change the world with a ball of string: Random acts and objects that made history (7.). Scholastic.

Chicago Style (17th ed.) Citation

Tim Cooke. How to Change the World with a Ball of String: Random Acts and Objects That Made History. 7. London: Scholastic, 2012.

MLA (9th ed.) Citation

Tim Cooke. How to Change the World with a Ball of String: Random Acts and Objects That Made History. 7. Scholastic, 2012.

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