cambridge, 2006
Buku Teks
Roy Wood Sellars; V.J. McGill; Marvin Farber (editor)
Macmillan, 1949
Buku Teks
edited by John K. Ryan
The Catholic University of America Press, 1963
Buku Teks
edited by John Herman Randali, Justus Buchler
Barnes & Noble, 1950
Buku Teks
Chen, Liu-Fu
Philosophical Library, 1948
Buku Teks