Roze, Maris
Getting results with English / Maris Roze
Houghton Miffiln, 1980
 Buku Teks
Zweifel, Thomas D.
Communicate or die : Getting results through speaking and listening
Selectbooks, 2009
 Buku Teks
Cook, Thomas A.
Mastering import & export management
American Management Association, 2004
 eBooks
Cook, Thomas A.
Mastering import & export management
[American Management Association;, ], 2012
 eBooks
Cook, Thomas A.
Mastering import and export management
[American Management Association, ], 2012
 eBooks