Bergmann, Gustav
University of Wisconsin Press, 1967
Buku Teks
Lewis, Martin W., author
University of California Press, 1997
Buku Teks
Little, Ian M.D.
The Clarendon Press, 1957
Buku Teks
Samford, Charles J.G., author
Basil Blackwell, 1989
Buku Teks
Eliot, T.S.
New York Tinehart 1948
Buku Teks