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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNational Research Council (U.S.). Highway Research Board, National Research Council (U.S.). Highway Research Board. Meeting, এবং National Research Council (U.S.). Committee on Pedestrians. Pedestrian Protection: 5 Reports Prepared for the 51st Annual Meeting. Washington: Highway Research Board, 1972.
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