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Чикаго-гийн эшлэл (17 дахь хэвлэлт)el tigi, aziz el din. Determining Investment Priority Ratings. cairo: the institute of national planning, 1964.
MLA -ийн эшлэл (9 дэх хэвлэлт)el tigi, aziz el din. Determining Investment Priority Ratings. the institute of national planning, 1964.