APA (7th ed.) Citation

Penrose, L. S., & Smith, G. F. 1. (1966). Down's anomaly. Churchill.

Chicago Style (17th ed.) Citation

Penrose, Lionel S., and George F. 1924-199X Smith. Down's Anomaly. London: Churchill, 1966.

MLA (9th ed.) Citation

Penrose, Lionel S., and George F. 1924-199X Smith. Down's Anomaly. Churchill, 1966.