editorial coordinator, Simone K. Schleifer
FKG, 2010
Buku Referensi
Benton, Allen H., author
Burgess Publishing Company, 1972
Buku Teks
Ministry of Foreign Affairs, 1995
Buku Teks
Schmitz, Werner
Klett Edition Deutsch, h 1993
Buku Teks
Knopp, Werner
Inter Nationes, 1986
Buku Teks