Chambers, Harold L., author
Prentice-Hall, 1980
Buku Referensi
Kenneth A. Adams, author
United States of America, 2008
Buku Teks
Adams, Kenneth A., author
American Bar Association, 2008
Buku Teks
Roberts, Arthur D.
McGraw-Hill , 1968
Buku Teks
McCalla, Thomas Richard, author
John Wiley & Sons, 1967
Buku Teks