Skolnick, Jerome H., author
John Wiley & Sons, 1966
Buku Teks
Skolnick, Jerome H.
John Wiley & Sons Inc., 1994
Buku Teks
The Council for Research in Values and Philosophy, 2005
Buku Teks
Auerbach, Jerold S., author
Oxford University Press, 1983
Buku Teks
Germann, A.C., author
C.C. Thomas, 1971
Buku Teks