Manson, Keith, author
B.T. Batsford , 1994
Buku Teks
Dickson, Donald T.
New York Free Press 1998,
Buku Teks
McGuinness, John, author
Blackwell Publishing, 2007
Buku Teks
Robert H. Perry, Don W. Green, James O. Moloney
Kementrian Pekerjaan Umum, 2006
Buku Referensi
Markanda, P.C., author
Lexis Nexis , 2001
Buku Teks