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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNational Academy of Engineering (U.S.). The Process of Technological Innovation: Symposium Sponsored by the National Academy of Engineering, April 24, 1968. Washington: National Academy of Sciences, 1969.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNational Academy of Engineering (U.S.). The Process of Technological Innovation: Symposium Sponsored by the National Academy of Engineering, April 24, 1968. National Academy of Sciences, 1969.
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