De Wulf, Maurice
Philosophy and civilization in the middle ages / Maurice de Wulf.
Dover Publications, Inc., 1922
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Tidman, Paul
Logic and philosophy : a modern introduction
Wadsworth, 1999
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Hausman, Alan
Logic and philosophy: a modern introduction
Wadsworth and Cengage Learning, 2013
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Patrick, George Thomas White
Introduction to philosophy
George Allen and Unwin, 1925
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Brightman, Edgar Sheffield
An Introduction to philosophy
Holt, Rinehart and Winston, 1961
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