Galbraith, John Kenneth, 1908-2006, author
Deutsch, 1974
Buku Teks
Gwartney, James D., author
The Reyden Press, 2000
Buku Teks
Haveman, Robert H., author
John Wiley & Sons, 1976
Buku Teks
Doblstein, Andrew W., author
Prentice-Hall, 1980
Buku Teks
McKenzie, Richard B., author
McGraw-Hill, 1980
Buku Teks