Mulvaney, Robert J.
Classic philosophical questions
Essex Pearson, 2014
 Buku Teks SO
Classic philosophical questions
edited by James A. Gould
Merril Publishing, 1989
 Buku Referensi
Barnes, Winston H.F.
The philosophical predicament
Adam & Charles Black, 1950
 Buku Teks SO
Langer, Susanne K.
Philosophical sketches
John Hopkins Press, 1964
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Descartes philosophical writings
selected and translated by Norman Kemp Smith
Modern Library, 1958
 Buku Teks SO