APA (7th ed.) Citation

Radford, E., & Radford, M. A. (1960). Death at the Chateau Noir. R. Hale.

Chicago Style (17th ed.) Citation

Radford, E., and M. A. Radford. Death at the Chateau Noir. London: R. Hale, 1960.

MLA (8th ed.) Citation

Radford, E., and M. A. Radford. Death at the Chateau Noir. R. Hale, 1960.