APA (7 वां संस्करण) प्रशस्ति पत्र
Barraclough, G. (1976). The Crucible of Europe: The Ninth and Tenth Centuries in European History. University of California Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Barraclough, Geoffrey. The Crucible of Europe: The Ninth and Tenth Centuries in European History. Berkeley: University of California Press, 1976.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Barraclough, Geoffrey. The Crucible of Europe: The Ninth and Tenth Centuries in European History. University of California Press, 1976.
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