Hindle, Brian Paul
B.T. Batsford Ltd, 1993
Buku Teks
Jahne, Johannes, author
Leipzig, 1964
Buku Teks
Erwin Frizi, author
Universitas Indonesia, 2014
UI - Skripsi (Membership)
Owen, Wilfred, author
Brookings Institution, 1951
Buku Teks
Lay, M.G
Australian Road Research Board, 1985
Buku Teks