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Чикаго-гийн эшлэл (17 дахь хэвлэлт)Bader. The Integration of The State Insurance Into The Economic System of The German Democratic Republic. Cairo: The Institute of National Planning, 1970.
MLA -ийн эшлэл (9 дэх хэвлэлт)Bader. The Integration of The State Insurance Into The Economic System of The German Democratic Republic. The Institute of National Planning, 1970.