APA (7th ed.) Citation

Estes, K. W., & Palmer, I. (2014). Super-heavy tanks of World War II. Osprey.

Chicago Style (17th ed.) Citation

Estes, Kenneth W., and Ian Palmer. Super-heavy Tanks of World War II. London: Osprey, 2014.

MLA (9th ed.) Citation

Estes, Kenneth W., and Ian Palmer. Super-heavy Tanks of World War II. Osprey, 2014.