APA (7th ed.) Citation

Kaufmann, J. E., & Kaufmann, H. W. (2019). Castle to Fortress: Medieval to Post-Modern Fortifications in the Lands of the Former Roman Empire.

Chicago Style (17th ed.) Citation

Kaufmann, J. E., and H. W. Kaufmann. Castle to Fortress: Medieval to Post-Modern Fortifications in the Lands of the Former Roman Empire. 2019.

MLA (9th ed.) Citation

Kaufmann, J. E., and H. W. Kaufmann. Castle to Fortress: Medieval to Post-Modern Fortifications in the Lands of the Former Roman Empire. 2019.

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