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Box, Paul C.
Institut of Transportation Engineers, 1976
Buku Referensi
Nippon Steel Corporation, [date of publication not identified]
Buku Referensi
Leslie D. "Doc" Long, Clifford Gordon, Charles F. Peck, Jack R. Benjamin
McGraw-Hill, 1982
Buku Referensi
Thompson, F.G.
Longman Scientific & Technical, 1992
Buku Teks