Epstein, Joseph, author
Norton, 1987
Buku Teks
edited by Sarah Tarlow and Susies West
Routledge, 1999
Buku Teks
Dworkin, Ronald
Harvard University Press, 1986
Buku Teks
Griffiths, Percival, Sir, 1899-, author
Ernest Benn, 1969
Buku Teks
Ohara, Daniel T, author
Duke University Press, 2003
Buku Teks