Federal Republic
Wiesbaden : Wiesbadener Graphische Betriebe GmbH, 1977
Buku Referensi
Heyde, Wolfgang
C.F. Muller Juristischer Verlag, 1999
Buku Teks
Federal Republic of Germany,, 1980
Buku Teks SO
Gumpel, Henry J.
Commerce Clearing House, 1969
Buku Teks SO
edited by The Linguistic Section of the Foreign Office of the Federal Republic of Germany
Press and Information Office, 1973
Buku Teks SO