APA (7th ed.) Citation

Branfill-Cook, R. (2012). X.1.: The Royal Navy's mystery submarine. Seaforth Publishing.

Chicago Style (17th ed.) Citation

Branfill-Cook, Roger. X.1.: The Royal Navy's Mystery Submarine. Barnsley, England: Seaforth Publishing, 2012.

MLA (9th ed.) Citation

Branfill-Cook, Roger. X.1.: The Royal Navy's Mystery Submarine. Seaforth Publishing, 2012.