edited by Andrew Blasko, Diana Januauskiene
Council for Research in Values and Philosophy, 2008
Buku Teks
Enzmann, Dieter R.
Raven, 1984
Buku Teks
McGovern, William M., author
University of North Carolina Press, 1939
Buku Teks
Duke University Press, 1973
Buku Teks
Fraser-Tytler, W.K.
Oxford University Press, 1950
Buku Teks