Silverthorn, Dee Unglaub, author
Pearson, Benjamin Cummings, 2010
Buku Teks
Hill, Charles W. L., author
Houghton Miffinn, 1989
Buku Teks
Schiffman, Harvey Richard, author
John Wiley & Sons, 1982
Buku Teks
Arens, Alvin A., author
Englewood Cliffs, N.J., Prentice-Hall of Southeast Asia
Buku Teks
Arens, Alvin A., author
Prentice Hall International, Inc., 2000
Buku Teks