Donaldson, Bruce
German: an essential grammar
Routledge, 2006
Buku Teks
Wessels, Dieter
Business German
Macmillan, 1992
Buku Teks
Ebert, Ronald J.
Business essential
Prentice-Hall, 1998
Buku Teks
Shaw, Gisela
Pocket dictionary of business German
Hodder & Stoughton, 1995
Buku Referensi
Collins business German
edited by Stephen Clarke
Harper Collins, 1995
Buku Referensi