APA (7th ed.) Citation

Service, O., & Gallagher, R. (2017). Think small: The surprisingly simple ways to reach big goals. Michael O'Mara Books Limited.

Chicago Style (17th ed.) Citation

Service, Owain, and Rory Gallagher. Think Small: The Surprisingly Simple Ways to Reach Big Goals. London: Michael O'Mara Books Limited, 2017.

MLA (9th ed.) Citation

Service, Owain, and Rory Gallagher. Think Small: The Surprisingly Simple Ways to Reach Big Goals. Michael O'Mara Books Limited, 2017.