(1959). Eastern underground activity against West Berlin. Senator for the Interior.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEastern Underground Activity Against West Berlin. Berlin-Wilmersdorf: Senator for the Interior, 1959.
एमएलए (8वां संस्करण) प्रशस्ति पत्रEastern Underground Activity Against West Berlin. Senator for the Interior, 1959.
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