U.P. Law Center, 1975
Buku Teks
Rodgers, Raymond
Alexander Hamiltion Institute, 1962
Buku Teks
Warren, Gorham & Lamont, Inc. , 1971
Buku Teks
edited by Philip A. Shaver
Warren, Gorham and Lamont, 1969
Buku Teks
Bradford, Frederick A.
Longmans, Green, 1932
Buku Teks