Affentranger, Christoph
Birkhal'user, 1997
Buku Teks
Schoffler, Herbert, author
Harrap, 1979
Buku Referensi
Routledge, 1997
Buku Referensi
Haensch, Gunther, author
BLV Verlagsgesellschaft, 1987
Buku Referensi
Breul, Karl, author
Boston D.C. Heath 1936
Buku Referensi