Não informado. (1951). International Political Science Abstracts. International Political Science Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. International Political Science Abstracts. Paris: International Political Science Association, 1951.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. International Political Science Abstracts. International Political Science Association, 1951.
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