APA (7th ed.) Citation

Freeman, R. A. (1920). The great portrait mystery. Hodder and Stoughton.

Chicago Style (17th ed.) Citation

Freeman, R. Austin. The Great Portrait Mystery. London: Hodder and Stoughton, 1920.

MLA (8th ed.) Citation

Freeman, R. Austin. The Great Portrait Mystery. Hodder and Stoughton, 1920.

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