American Associations of State Highway and Transportations Official
American Associations of State Highway and Transportations Official, 2008
Buku Referensi
Krebs, Robert D., author
McGraw-Hill, 1971
Buku Teks
Sherwood, P. T.
Thomas Telford, 1995
Buku Teks
Mohd Izzat Mohd Thiyahuddin, author
Faculty of Engineering, Universitas Indonesia, 2013
Artikel Jurnal
Japan Transportation Consultants , 1979
Buku Teks