APA (7th ed.) Citation

Heer, F. (1968). The Holy Roman Empire. Praeger.

Chicago Style (17th ed.) Citation

Heer, Friedrich. The Holy Roman Empire. New York: Praeger, 1968.

MLA (9th ed.) Citation

Heer, Friedrich. The Holy Roman Empire. Praeger, 1968.

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