Elsberger, Stefan
BMS Platt GmbH , 1995
Buku Teks
Herder & Co. C.M.B.H. Verlagsbuchhandlung, [date of publication not identified]
Buku Referensi
Kratzer, Angelika
Athenaum, 1973
Buku Teks
Gayed, Riad, author
Elia's Modern Press, [date of publication not identified]
Buku Referensi
F. A. Brockhaus, 1975
Buku Referensi