Pizonial Sasrihila
Universitas Indonesia, 2002
UI - Skripsi Membership
Jacobs, Allan B.
MIT Press, 1993
Buku Teks
Rapoport, Amos
Plenum Press, 1990
Buku Teks
American Association of State Highway and Transportation Officials
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Buku Teks
Wass, Alonzo
Reston, VA: Reston Publishing, 1973
Buku Teks