Pojman, Louis P.
Wadsworth and Cengage Learning, 2012
Buku Teks
Bart Streumer.
Wiley-Blackwell , 2014
Buku Teks
Kagan, Shelly
Westview Press, 1997
Buku Teks
Albert, Ethel M.
American Book Company, 1953
Buku Teks
selected and edited by Wilfrid Sellars and John Hospers
Appleton-Century-Crofts, 1952
Buku Teks