Schoffler, Herbert, author
Harrap, 1979
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Messinger, Heinz, author
Langenscheidt, 1993
Buku Referensi
Goulden, W. O., author
Little, Brown, 1955
Buku Referensi
Tiger Books International, 1994
Buku Referensi
Breul, Karl, author
Boston D.C. Heath 1936
Buku Referensi