Watson, Donald Stevenson, author
Houghton Miffiln, 1960
Buku Teks
Lundberg, Erik, author
Harvard University Press, 1957
Buku Teks
Princenton University Press , 1955
Buku Teks
American Society of Civil Engineers, 1981
Buku Teks
World, Bank, author
The International Bank for Reconstruction and Development, 1995,
Buku Referensi