APA (7th ed.) Citation

Christie, A., Gregg, G., & Belew, R. (1944). The boomerang clue. Dell Publishing Company.

Chicago Style (17th ed.) Citation

Christie, Agatha, Gerald Gregg, and Ruth Belew. The Boomerang Clue. New York, N.Y.: Dell Publishing Company, 1944.

MLA (9th ed.) Citation

Christie, Agatha, et al. The Boomerang Clue. Dell Publishing Company, 1944.