National Research Council (U.S.). Highway Research Board. (1957). Manpower potentials in highway engineering: Presented at the Thirty-sixth Annual Meeting, January 7-11, 1957. Highway Research Board.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNational Research Council (U.S.). Highway Research Board. Manpower Potentials in Highway Engineering: Presented at the Thirty-sixth Annual Meeting, January 7-11, 1957. Washington: Highway Research Board, 1957.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিNational Research Council (U.S.). Highway Research Board. Manpower Potentials in Highway Engineering: Presented at the Thirty-sixth Annual Meeting, January 7-11, 1957. Highway Research Board, 1957.
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