Routledge, 1997
Buku Referensi
Corvin, Michel
Bordas, 1991
Buku Referensi
Faculty of Civil Engineering, Universiti Teknologi Malaysia ,
Majalah, Jurnal, Buletin
Twort, A. C.
Arnold, 1995
Buku Teks
Urquhart, Leonard Church
McGraw-Hill , 1950
Buku Teks