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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিkamel, ahmed f. Uar Foreign Trade Repercussions on Economic Development. cairo: the institute of national planning, 1967.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিkamel, ahmed f. Uar Foreign Trade Repercussions on Economic Development. the institute of national planning, 1967.