APA (7th ed.) Citation

Stewart, R. J. (1988). Barbarossa: Scourge of Europe (1. publ.). Firebird Books.

Chicago Style (17th ed.) Citation

Stewart, Robert J. Barbarossa: Scourge of Europe. 1. publ. Poole: Firebird Books, 1988.

MLA (9th ed.) Citation

Stewart, Robert J. Barbarossa: Scourge of Europe. 1. publ. Firebird Books, 1988.

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