APA (7th ed.) Citation

Trim, D. J. B. (2003). The chivalric ethos and the development of military professionalism. History of warfare.

Chicago Style (17th ed.) Citation

Trim, David J. B. "The Chivalric Ethos and the Development of Military Professionalism." History of Warfare 2003.

MLA (8th ed.) Citation

Trim, David J. B. "The Chivalric Ethos and the Development of Military Professionalism." History of Warfare, 2003.