Becker, William E., author
Prentice-Hall, 1971
Buku Teks
Atkinson, Lloyd C., author
Richard D. Irwin, 1982
Buku Teks
Gwartney, James D., author
The Reyden Press, 2000
Buku Teks
Gwartney, James D., author
Harcourt Brace Jovanovich, 1990
Buku Teks
Gwartney, James D., author
Harcourt Brace Jovanovich, 1987
Buku Teks