Ritter, Lawrence S., author
Basic Books, 1970
Buku Teks
Steiner, William Howard, author
Henry Holt, 1956
Buku Teks
Klein, John J., 1929-, author
Harcourt, Brace & World, 1965
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Luckett, Dudley G., author
McGraw-Hill , 1984
Buku Teks
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