Schiffman, Leon G., author
Prentice-Hall, 1991
Buku Teks
Schiffman, Leon G., author
Prentice-Hall, 1991
Buku Teks
Mowen, John C., author
Prentice-Hall, 2000
Buku Teks
Schiffman, Leon G., author
Prentice Hall International, 2000
Buku Teks
Engel, James F., author
The Dryden Press, 1986
Buku Teks