Baldridge, J. Victor, author
John Wiley & Sons, 1980
Buku Teks
Carman, Robert A., author
John Wiley & Sons, 1980
Buku Teks
Kolb, David A., author
Prentice-Hall, 1991
Buku Teks
Abraham B. Shani, James Brownlee Lau, Dawn Chandler, Jean-Farncois Coget
McGraw-HIll, 2009
Buku Teks
Harvey, Donald F., author
Prentice Hall International, 1996
Buku Teks