APA (7th ed.) Citation

Christie, A. Dumb witness. An imprint of Harper collins Publishers.

Chicago Style (17th ed.) Citation

Christie, Agatha. Dumb Witness. London: An imprint of Harper collins Publishers.

MLA (9th ed.) Citation

Christie, Agatha. Dumb Witness. An imprint of Harper collins Publishers.

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