Toynbee, A. J. The breakdowns of civilizations (7a ed.).
Lua i Stíl Chicago (17ú heag.)Toynbee, Arnold J. The Breakdowns of Civilizations. 7a ed.
Lua MLA (8ú heag.)Toynbee, Arnold J. The Breakdowns of Civilizations. 7a ed.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.