Waldmann, Raymond J.
American Enterprise Institute , 1980
Buku Teks
Handler, Milton
The Foundation Press, 1967
Buku Teks
Anderson, Ronald A., author
South-Western Publishing Company, 1950
Buku Teks
Morgan, Thomas D.
ST. Paul MInn, 1978
Buku Teks
edited by Walter Sterling Surrey and Crawford Shaw
American Law Institute, 1963
Buku Teks