APA (7th ed.) Citation

Christie, A. (1993). The Thirteen problems. Harper Collins Publishers.

Chicago Style (17th ed.) Citation

Christie, Agatha. The Thirteen Problems. London: Harper Collins Publishers, 1993.

MLA (9th ed.) Citation

Christie, Agatha. The Thirteen Problems. Harper Collins Publishers, 1993.

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