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
Cambridge international dictionary of english
editor in chief Paul Procter
Cambridge University Press, 1995
 Buku Referensi
Corbett, Jim
English for international banking and finance
Cambridge University Press , 1990
 Buku Teks