APA (7th ed.) Citation

Christie, A. (2003). The mysterious Mr Quin. HarperCollins Publishers.

Chicago Style (17th ed.) Citation

Christie, Agatha. The Mysterious Mr Quin. London: HarperCollins Publishers, 2003.

MLA (9th ed.) Citation

Christie, Agatha. The Mysterious Mr Quin. HarperCollins Publishers, 2003.

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