Federal Republic
Wiesbaden : Wiesbadener Graphische Betriebe GmbH, 1977
Buku Referensi
Kohlhammer, 1961
Buku Teks SO
Foreign office of the federal Republic of Germany , 1982
Buku Teks
German Academic Exchange Service, [date of publication not identified]
Buku Teks
Heyde, Wolfgang
C.F. Muller Juristischer Verlag, 1999
Buku Teks