Lua APA (7ú heag.)
Kagan, D. (1962). Decline and fall of the Roman Empire: why did it collapse?.: Why did it collapse? Heath.
Lua i Stíl Chicago (17ú heag.)
Kagan, Donald. Decline and Fall of the Roman Empire: Why Did It Collapse?.: Why Did It Collapse? Boston: Heath, 1962.
Lua MLA (9ú heag.)
Kagan, Donald. Decline and Fall of the Roman Empire: Why Did It Collapse?.: Why Did It Collapse? Heath, 1962.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.