Carter, Stephen L.
Harvard University Press, 1998
Buku Teks
Turner, Bryan S., author
Sage, 1983
Buku Teks
Council for Research in Values and Philosophie, 2004
Buku Teks
Wasby, Stephen L.
Charles Scribner`s Sons, 1973
Buku Teks
Nancy LoPatin-Lummis, editor
Wiley-Blackwell, 2008
Buku Teks