Clark, Lyn R.
Business english and communication
McGraw-Hill, 2000
 Buku Teks SO
Clark, Lyn R.
Business english and communication
McGraw-Hill, 2000
 Buku Teks SO
Mulyo Wibowo
Interchange center
Fakultas Teknik Universitas Indonesia, 1995
 UI - Skripsi Membership
Corbett, Jim
English for international banking and finance
Cambridge University Press , 1990
 Buku Teks
Wallwork, Adrian
English for Presentations at International Conferences
Springer, 2010
 Buku Teks SO