Whitlam, E.G., author
Widescope, 1977
Buku Teks
McCarthy, Frederick D., author
A Colorgravure , [Date of publication not identified]
Buku Teks
Moore, Russell F., author
Littlefield, Adams, 1957
Buku Teks
Finer, S. E.
Clarendon Press Oxford, 1995
Buku Teks
Andrews, William G.
D.van Nostrand Company,Inc., 1968
Buku Teks