Kluge, Friedrich, 1856-1926, author
Walter De Gruyter, 1963
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Gamillscheg, Ernst, author
Carl Winter's Universitatsbuchhandlung, 1928
Buku Referensi
Wasserzieher, Ernst, author
Ferd Dummlers Verlag, 1966
Buku Referensi
Gayed, Riad, author
Elia's Modern Press, [date of publication not identified]
Buku Referensi
Kupper, Heinz, author
Claassen Verlag, 1965
Buku Referensi