Potter, George B., author
Business, 1984
Buku Teks
Arnold, Robert R., author
John Wiley & Sons, 1978
Buku Teks
Langenbach, Robert G., author
Prentice-Hall, 1968
Buku Teks
Thierauf, Robert J., author
John Wiley & Sons, 1980
Buku Teks
Lott, Richard W., author
Prentice-Hall, 1967
Buku Teks