Arntz, Helmut
Media Consulta, 1962
Buku Teks
Media Consulta, 2003
Buku Referensi
Arntz, Helmut
Press and Information Office of the Federal German, 1962
Buku Teks SO
Berlin : Media Consulta, 1993
Buku Teks SO
Zweig, Arnold
Berlin Aufbau 1959
Buku Teks