National Academic Press, 2020
Buku Referensi
National Academic Press, 2020
Buku Referensi
Transportation Research Board, National Research Council, 1985
Buku Referensi
edited by Robert F. Baker, L.G. Byrd and D. Grant Mickle
Van Nostrand Reinhold, 1975
Buku Referensi
Thompson, F.G.
Longman Scientific and Technical, 1992
Buku Teks SO