Collins German college dictionary
HarperCollins, 1995
Buku Referensi
Collins German dictionary
HarperCollins,
Buku Referensi
Wessels, Dieter
Business German
Macmillan, 1992
Buku Teks SO
Pass, Chirtopher
Collins kamus lengkap bisnis = Colins dictionary of business
Erlangga, 1997
Buku Referensi
Mascull, Bill
Collins Cobuild: key words in business / Bill Mascull
HarperCollins Pub , 1996
Buku Teks SO