Ott, David J.
The Brookings Institution, 1977
Buku Teks
U.S. Govt. Print. Off, 1987
Buku Teks
American Institute of Certified Public Accountants , 1989
Buku Teks
Kohler, Eric L.
Prentice-Hall, 1957
Buku Teks
Browne, Vincent J.
Public Affairs Press, 1949
Buku Teks