APA (7th ed.) Citation

Salter, C. (2019). 100 letters that changed the world. Universe Publishing.

Chicago Style (17th ed.) Citation

Salter, Colin. 100 Letters That Changed the World. New York, NY: Universe Publishing, 2019.

MLA (9th ed.) Citation

Salter, Colin. 100 Letters That Changed the World. Universe Publishing, 2019.

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