Adelman, Martin J., author
Thomson/West, 2009
Buku Teks
Merges, Robert Patrick, author
Michie, 1997
Buku Teks
Goldstein, E. Ernest, author
Foundation Press, 1959
Buku Teks
Schlesinger, Rudolf B.
The Foundation Press, 1950
Buku Teks
Kauper, Paul G., author
Little, Brown, 1971
Buku Teks