APA (7th ed.) Citation

Christie, A. (1995). Agatha Christie omnibus: 1920s [novels]. HarperCollins.

Chicago Style (17th ed.) Citation

Christie, Agatha. Agatha Christie Omnibus: 1920s [novels]. Hammersmith, London: HarperCollins, 1995.

MLA (9th ed.) Citation

Christie, Agatha. Agatha Christie Omnibus: 1920s [novels]. HarperCollins, 1995.

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