APA (7th ed.) Citation

Christie, A. (2006). 1920s omnibus. HarperCollins Publishers.

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

Christie, Agatha. 1920s Omnibus. HarperCollins Publishers, 2006.

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