Wheare, K. C., author
Oxford University Press, 1975
Buku Teks
Maddex, Robert L., author
London: Routledge, 1995,
Buku Referensi
Moore, Russell F., author
Littlefield, Adams, 1957
Buku Teks
Whitlam, E.G., author
Widescope, 1977
Buku Teks
edited by Anthony Milner and Mary Quilty
Oxford University Press, 1997
Buku Teks