Toynbee, A. J. The breakdowns of civilizations (7a ed.).
Cita Chicago (17th ed.)Toynbee, Arnold J. The Breakdowns of Civilizations. 7a ed.
Cita MLA (8th ed.)Toynbee, Arnold J. The Breakdowns of Civilizations. 7a ed.
Atenció: Aquestes cites poden no estar 100% correctes.