APA (7th ed.) Citation

Gurstelle, W. (2014). Defending your castle: Build catapults, crossbows, moats, bulletproof shields, and more defensive devices. Chicago Review Press, Incorporated.

Chicago Style (17th ed.) Citation

Gurstelle, William. Defending Your Castle: Build Catapults, Crossbows, Moats, Bulletproof Shields, and More Defensive Devices. Chicago, Illinois: Chicago Review Press, Incorporated, 2014.

MLA (8th ed.) Citation

Gurstelle, William. Defending Your Castle: Build Catapults, Crossbows, Moats, Bulletproof Shields, and More Defensive Devices. Chicago Review Press, Incorporated, 2014.

Warning: These citations may not always be 100% accurate.