Brugger S.J., Walter, author
Wieh Herder 1948
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Auchter, Thomas
Gottingen Vandenhock & Ruprecht 1999
Buku Referensi
Leipzig Veb Bibliographisches Institut 1960
Buku Referensi
Mackensen, Lutz, author
Munchen Sudwest 1986
Buku Referensi
Klappenbach, author
Berlin Akademie 1963
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