APA (7th ed.) Citation

(2011). Fifty hats that changed the world. Conran Octopus.

Chicago Style (17th ed.) Citation

Fifty Hats That Changed the World. London: Conran Octopus, 2011.

MLA (9th ed.) Citation

Fifty Hats That Changed the World. Conran Octopus, 2011.

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