Seelye, Elwyn E.
New York: John Wiley & Sons, 1954
Buku Teks
Scott, Stephen
Arnold, 1997
Buku Teks
American Society of Civil Engineers, 2018
Majalah, Jurnal, Buletin
Hansen, Karen, author
John Wiley & Sons, 2011
Buku Teks
Tomlinson, M.J. (Michael John), author
E & Fn Spon, 1997
Buku Referensi