APA (7th ed.) Citation

Helfand, L. (2016). They changed the world. Campfire.

Chicago Style (17th ed.) Citation

Helfand, Lewis. They Changed the World. New Delhi, India: Campfire, 2016.

MLA (8th ed.) Citation

Helfand, Lewis. They Changed the World. Campfire, 2016.

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