APA (7th ed.) Citation

Enever, T. (1999). Britain's best kept secret: Ultra's Base at Bletchley Park (revised and expanded 3rd edition.). Sutton Publishing.

Chicago Style (17th ed.) Citation

Enever, Ted. Britain's Best Kept Secret: Ultra's Base at Bletchley Park. revised and expanded 3rd edition. Stroud: Sutton Publishing, 1999.

MLA (9th ed.) Citation

Enever, Ted. Britain's Best Kept Secret: Ultra's Base at Bletchley Park. revised and expanded 3rd edition. Sutton Publishing, 1999.