APA (7th ed.) Citation

Radford, E., & Radford, M. A. (1970). Murder is ruby red. Hale.

Chicago Style (17th ed.) Citation

Radford, E., and M. A. Radford. Murder Is Ruby Red. London: Hale, 1970.

MLA (8th ed.) Citation

Radford, E., and M. A. Radford. Murder Is Ruby Red. Hale, 1970.