Speier, H. (1969). Force and folly: Essays on foreign affairs and the history of ideas. M.I.T. Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSpeier, Hans. Force and Folly: Essays on Foreign Affairs and the History of Ideas. Cambridge, Mass: M.I.T. Press, 1969.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSpeier, Hans. Force and Folly: Essays on Foreign Affairs and the History of Ideas. M.I.T. Press, 1969.
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