Babb, Hugh W., author
Foundation Press , 1959
Buku Teks
Hamilton, Robert W., author
West Publishing, 1990
Buku Teks
Dubben, Nigel, author
Wiley-Blackwell, 2009
Buku Teks
McKee, William S., author
Warren,Gorham and Lamont, 1978
Buku Teks
Mariotti, John
Capstone, 2002
Buku Teks