Hurley, Patrick J., 1883-1963, author
Wardsworth Cengage Learning, 2012
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Copi, Irving M., author
Prentice-Hall, 1979
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Dalen, Dirk van, author
Springer-Verlag, 1994
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Jeffrey, Richard, author
McGraw-Hill, 1981
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Maier, David, author
The Benjamin Cumming Pub., 1988
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