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
 Buku Teks SO
Ayer, Alfred Jules, 1910-1989
The central questions of philosophy
Penguin Books, 1982
 Buku Teks SO