Calkins, R. G. (1998). Medieval architecture in western europe: From a.d. 300 to 1500. Oxford unversity.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCalkins, Robert G. Medieval Architecture in Western Europe: From A.d. 300 to 1500. New York: Oxford unversity, 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCalkins, Robert G. Medieval Architecture in Western Europe: From A.d. 300 to 1500. Oxford unversity, 1998.
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