Gamillscheg, Ernst
Carl Winter's Universitatsbuchhandlung, 1928
Buku Referensi
Wasserzieher, Ernst
Ferd Dummlers Verlag, 1966
Buku Referensi
Gayed, Riad
Elia's Modern Press, [date of publication not identified]
Buku Referensi
Kupper, Heinz
Claassen Verlag, 1965
Buku Referensi
Klappenbach
Berlin Akademie 1963
Buku Referensi