Langer, Susanne K.
Philosophical sketches
John Hopkins Press, 1964
 Buku Teks
Mulvaney, Robert J.
Classic philosophical questions
Essex Pearson, 2014
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Classic philosophical questions
editor, James A. Gould
Charles E. Merrill , 1971
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Pojman, Louis P.
Philosophical traditions a text with readings
Thomson Wadsworth, 2006
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Cornman, James W.
Philosophical problems and arguments: an introduction
Macmillan, 1968
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