Plamen Makariev
The Council for Research in Values and Philosophy, 2001
Buku Teks
Scheiner, Irwin, author
University of California Press, 1970
Buku Teks
Pratt, Douglas, author
Brill, 2017
eBooks
Husseini, Sara Leila, author
Brill, 2014
eBooks
Hryniewicz, Waclaw
Council for Research in Values and Philosophy, 2007
Buku Teks