APA (7th ed.) Citation

Kagan, D. (1966). Decline and fall of the Roman Empire: Why did it collapse? D. C. Heath and Company.

Chicago Style (17th ed.) Citation

Kagan, Donald. Decline and Fall of the Roman Empire: Why Did It Collapse? Boston: D. C. Heath and Company, 1966.

MLA (9th ed.) Citation

Kagan, Donald. Decline and Fall of the Roman Empire: Why Did It Collapse? D. C. Heath and Company, 1966.