Hryniewicz, Waclaw
Council for Research in Values and Philosophy, 2007
Buku Teks
Buku Teks
Winzeler, Robert L.
Lanham Rowman & Littlefield, 2016
Buku Teks
Storey, John, 1950-
Prentice-Hall, 2000
Buku Teks
Gary Burns, editor
Wiley Balckwell, 2016
Buku Teks