Virmani, B.R., author
Vision Books, 1998
Buku Teks
Katz, Harry C., author
McGraw-Hill, 2003
Buku Teks
Levinson, Harold M., author
John Wiley & Sons, 1966
Buku Teks
Musgrave, Richard A., author
McGraw-Hill, 1983
Buku Teks
Fesler, James W. (James William), 1911-2005, author
Prentice-Hall, 1980
Buku Teks