Ebenstein, William, author
Thomson Wadsworth, 2002
Buku Teks
Ebenstein, William, author
Thomson Learning, 2000
Buku Teks
David Boucher, Paul Kelly, editor
Oxford Univesity Press, 2009
Buku Teks
edited by F.J.C. Hearnshaw
Barnes & Noble, 1949
Buku Teks
edited by Isaac Kramnick
[publisher not identified], 1969
Buku Teks