Schlecht, Phillip C., 1937-, author
Jossey-Bass, 1997
Buku Teks
O`Donnell, Angela M., author
John Wiley & Sons, 2012
Buku Teks
The ASEAN Secretariat, 2000
Buku Teks
Sparling, Keith
McGraw-Hill, 1994
Buku Teks
Bock, Steven J.
Vermilion , 1995
Buku Teks