edited by James Barros
The Free Press, 1972
Buku Teks
Linfield, Robert F., author
Noyes Data, 1995
Buku Teks
edited by Barry B. Baker
The Haworth Press, 1993
Buku Teks
Christol, Carl Quimby, author
Kluwer Law and Taxation , 1991
Buku Teks
Konrad-Adenauer-Stiftung, 2004
Buku Teks