Woodhouse, Mark B., author
Wadsworth, 1984
Buku Teks
William Ernest Hocking...[et al.]
Macmillan, 1957
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, author
Philosophical Library, 1948
Buku Teks