APA (7th ed.) Citation

Christie, A. (2006). 1920's omnibus. London : HarperCollins.

Chicago Style (17th ed.) Citation

Christie, Agatha. 1920's Omnibus. London : HarperCollins, 2006.

MLA (9th ed.) Citation

Christie, Agatha. 1920's Omnibus. London : HarperCollins, 2006.

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