Cita APA (7th ed.)
Barraclough, G. (1976). The Crucible of Europe: The Ninth and Tenth Centuries in European History. University of California Press.
Cita Chicago (17th ed.)
Barraclough, Geoffrey. The Crucible of Europe: The Ninth and Tenth Centuries in European History. Berkeley: University of California Press, 1976.
Cita MLA (9th ed.)
Barraclough, Geoffrey. The Crucible of Europe: The Ninth and Tenth Centuries in European History. University of California Press, 1976.
Atenció: Aquestes cites poden no estar 100% correctes.