APA (7th ed.) Citation

Sarah Morgan. (2017). How to Keep a Secret. HarperCollins Publishers Ltd.

Chicago Style (17th ed.) Citation

Sarah Morgan. How to Keep a Secret. London: HarperCollins Publishers Ltd, 2017.

MLA (9th ed.) Citation

Sarah Morgan. How to Keep a Secret. HarperCollins Publishers Ltd, 2017.

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