APA (7th ed.) Citation

Carr, J. D. (1939). The problem of green capsule. Bantam Books.

Chicago Style (17th ed.) Citation

Carr, John Dickson. The Problem of Green Capsule. N. Y: Bantam Books, 1939.

MLA (9th ed.) Citation

Carr, John Dickson. The Problem of Green Capsule. Bantam Books, 1939.