Rutz, Werner
Ferdinand Schoningh, 1976
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Ehrismann, Gustav, author
C.H.Beck'sche Verlagsbuchhandlung,, 1961 & 1965
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Bruckmann Munchen, 1970
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Heiss, Robert
A. Francke, 1948
Buku Teks
Breysing, Kurt
Berlin Walter de Gruyter 1955
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