Não informado. (1967). International Social Security Review. International Social Security Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. International Social Security Review. Geneva, Suíça: International Social Security Association, 1967.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. International Social Security Review. International Social Security Association, 1967.
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