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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিeleish, g. An Introduction to the Input- Output Model. cairo: the institute of national planning, 1962.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিeleish, g. An Introduction to the Input- Output Model. the institute of national planning, 1962.