Barraclough, G. (1979). Turning Points in World History. Thames and Hudson.
Cita Chicago (17th ed.)Barraclough, Geoffrey. Turning Points in World History. Thames and Hudson, 1979.
Cita MLA (9th ed.)Barraclough, Geoffrey. Turning Points in World History. Thames and Hudson, 1979.
Atenció: Aquestes cites poden no estar 100% correctes.