Cita APA (7a ed.)

Freeman, D., & Freeman, J. (2013). How to keep calm and carry on: Inspiring ways to worry less and live a happier life (1st edition.). Pearson.

Cita Chicago Style (17a ed.)

Freeman, Daniel, y Jason Freeman. How to Keep Calm and Carry on: Inspiring Ways to Worry Less and Live a Happier Life. 1st edition. Harlow, England: Pearson, 2013.

Cita MLA (9a ed.)

Freeman, Daniel, y Jason Freeman. How to Keep Calm and Carry on: Inspiring Ways to Worry Less and Live a Happier Life. 1st edition. Pearson, 2013.