Brown, Peter, 1935-, author
Wiley-Blackwell, 2013
Buku Teks
Kenny, Anthony
Oxford University Press, 2008
Buku Teks
Muller, Herbert J., author
Harper & Row, 1963
Buku Teks
Easton, Stewart C., author
Praeger, 1964
Buku Teks
Stipp, John L.
John Wley, 1967
Buku Teks