Kenneth A. Adams
United States of America, 2008
Buku Teks
Adams, Kenneth A.
American Bar Association, 2008
Buku Teks
Roberts, Arthur D.
McGraw-Hill , 1968
Buku Teks
McCalla, Thomas Richard
John Wiley & Sons, 1967
Buku Teks
Heller, Dan
O`Reilly, 1991
Buku Referensi