APA (7th ed.) Citation

Christie Agatha. (2007). Agatha Christie and then there were none. Harper books.

Chicago Style (17th ed.) Citation

Christie Agatha. Agatha Christie and Then There Were None. London: Harper books, 2007.

MLA (9th ed.) Citation

Christie Agatha. Agatha Christie and Then There Were None. Harper books, 2007.

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