Collins German college dictionary
Harper Collins Publisher, 1995
Buku Referensi
Collins German dictionary
Harper Collins Publisher, 1991,
Buku Referensi
Wessels, Dieter
Business German
Macmillan, 1992
Buku Teks
Mascull, Bill
Collins Cobuild: key words in business / Bill Mascull
HarperCollins Pub , 1996
Buku Teks
Pass, Chirtopher
Collins kamus lengkap bisnis = Colins dictionary of business
Erlangga, 1997
Buku Referensi