APA (7th ed.) Citation

Christie, A. (1972). Thirteen problems. Published for the Crime Club by Collins.

Chicago Style (17th ed.) Citation

Christie, Agatha. Thirteen Problems. London: Published for the Crime Club by Collins, 1972.

MLA (9th ed.) Citation

Christie, Agatha. Thirteen Problems. Published for the Crime Club by Collins, 1972.

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