APA (7th ed.) Citation

KAGAN, D. (1962). Decline and fall of the Roman empire: Why did it collapse? D.C. Heath.

Chicago Style (17th ed.) Citation

KAGAN, Donald. Decline and Fall of the Roman Empire: Why Did It Collapse? Boston: D.C. Heath, 1962.

MLA (9th ed.) Citation

KAGAN, Donald. Decline and Fall of the Roman Empire: Why Did It Collapse? D.C. Heath, 1962.

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